Difference between revisions of "Text-Handling in GIMP"

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* Text, which has no container.
 
* Text, which has no container.
  
* And vector object containers
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* Vector object containers
  
  

Revision as of 13:10, 17 April 2012

Introduction

Going beyond just looking at the Text tool, this project is about the complete text handling in GIMP. Examples of what this project addresses are: typographical control to the highest degree; wrapping to paths; arbitrary vector shapes for text boxes; placement and stacking order of multiple text boxes within a layer.

Vision

To guide all of the design work of this project, a vision was formulated for it. We combined GIMP’s product vision with insight into the activity and needs of core GIMP users where it comes to text, and added into the mix GIMP’s roadmap (i.e. GEGL). Boiled down to the essence, the vision is as follows:

  • Text in GIMP is always part of the composition—unless it is an annotation
  • The canvas is not a page; there is no such thing as paging in GIMP
  • Text in GIMP is both for reading and used as graphical shapes; meta data in text—mark-up, semantics—are not supported

GIMP users get:

  • Minute control over typography and the layout of text on the canvas
  • internationalisation of text handling, for all locales supported by unicode
  • text remains editable forever
  • super-fast workflow, when they are experienced

Functionality

Field survey

In order to compile a comprehensive list of what future text-handling in GIMP should include, we did a survey of other software packages in the field of GIMP.

Text in InDesign

Text in Scribus

Text in Photoshop

Text in Inkscape

Additionally a review of current text-functionality in GIMP, its technical background as well as capabilities of current or future libraries has been done.

Updated Text Functionality in Gimp 2.7.4

Processing of Text Input in Gimp

Pango features

Harfbuzz

note: just about all traits and transformations described below that can be applied to text, can be applied to:

  • a point in the text
  • a span
  • a paragraph
  • the whole text instance
  • several instances of texts

Internationalisation

  • multiple writing systems in the same text-box

Annotations

  • add, edit and delete annotations
  • show/hide
  • relate annotation to canvas
  • file-wide search of annotation text

Text box

  • add and delete text boxes
  • set position, size and stacking order
  • cut, copy + paste of boxes
  • wrap text to box or dynamic text box
  • text overflow from box to box

Text box geometry

  • text boxes of any shape
  • text (baseline, top of caps) along path
  • alignment axis (left, right , centre) along path
  • box geometry transformations

Text

  • add and delete characters
  • full support for all characters covered by Unicode
  • insert and overwrite
  • cut, copy + paste
  • mangage line-breaks, paragraphs, etc.
  • transformations
    • to upper, to lower, capitalise
    • rotate
  • execute spell check
    • select language (…-100s)
  • search + replace, for this text, whole file + all open files
  • rendering glyphs: fill, stroke and line style; see work on vector tool

Rulers

Typography

  • presets can be added, edited, deleted and applied
  • manual access to all characters of a font: Glyph palette

Character level

  • set font family (…-100s)
  • set font variant (1-~20)
  • set size(values between 1-infinite)
  • set color
  • set hinting (2-5)
  • set kerning (value)
  • set tracking (value)
  • toggle faux bold+italics (0,1)(0,1)
  • toggle underline (0,1) + (options)
  • toggle through-line (0,1) + (options)
  • set baseline shift (value)

see the list of non script-specific OpenType features (68) examples:

  • historical ligatures: Some ligatures were in common use in the past, but appear anachronistic today. Some fonts include the historical forms as alternates, so they can be used for a 'period' effect.
  • superscript: use to automatically access the superior figures (more legible than scaled figures)

+ there are the script-specific features (also ~68)

  • set glyph scaling (vertical and horizontal) (2 values)

line and paragraph level

  • set margins (4 values)
  • set leading (value)
  • set indent (value)
  • choose alignment (justification (1 [?+4 for last line]), flush (2), center)
  • set inter-paragraph spacing (value)
  • choose text-flow (all 4 directions)

User scenarios

Photographer (Annotations)

(see scenario 1a)

  • open file
  • apply changes
  • add text information to image
    • no effects, basic font+style+size
  • place text closer to part of image the note is about
  • on/off for annotations when wanting to work undisturbed

Creating Original Art

text as graphics

  • [no-text work]
  • freely define text-box-shape
  • enter text
  • experiment with font-family/variant/size/color
  • apply effects on all text elements
  • apply overall effect (let text "interact" with other parts of the composition)
  • transformation of text(-box) for perspective, 3D, paths.
  • fine-tune text, making use of advanced typography and optional manual replacements
  • apply more effects/brushwork/…
  • change wording

text as information

  • create several text-boxes (e.g. info)
    • define overflow direction
  • enter text / paste text (formatted or plain)
  • work on typography
    • basic settings font family + variant + size + color
    • set paragraph or text-box layouting (e.g. alignment, justification, writing direction, hyphenation)
    • fine-tune text, making use of advanced typography/OpenType and optional manual replacements
  • move, resize, reshape, reorder boxes
  • save/export/print
  • return later - load file
  • change wording/correct text
    • maybe change font (other computer)
    • adjust typography
  • save/export/print

Icon Design

  • Open/hot link to vector image
  • Polish & refine the icon
  • add very small amount of text
    • manually pick a glyph
  • deform text (vector-based)
  • apply pixel-based effects
  • Review icon & make changes to vector image (& edit text in GIMP). Go back to the 2nd bullet, and repeat.
  • Save Icon

Web Images - Production

text use mostly in buttons etc.

  • insert text, where it needs to be graphically altered or integrated with the pixel level
  • replacement of text for production of multiple instances of the same design element
  • Make sets of image elements, see how they work together
    • see how use of text in different parts works together - adjust typography accordingly
  • Export parts in optimised web format

Evaluation

evaluated tools: GIMP (2.7.4), Inkscape, Scribus, InDesign, Photoshop

Photographer (Annotations)

text placement

one-click or define frame first (Gimp, Photoshop, Inkscape)

  • + gives most flexibility
  • + is easy to handle with one button
  • + feels real. You can grab a pen, place it and start writing right away

the mouse pointer is important. A Cursor I is not useful for creating a box and a + is not handy to start typing right away.

Mandatory fixed-box definition (Indesign, Scribus)

  • - may disturb the work-flow in a graphic tool but is appropriate for desktop publishing. In a graphic-context users should decide whether they want to break lines manually with the Enter-Button or by pre-defining a vertical border (e.g. the right and lower side of the box).

adding second element

click anywhere outside the text-box

  • + fast
  • + text-tool does what can be expected

confirm editing, then click outside the text-box (Photoshop)

  • + (see moving the box)
  • - gets in the way of quickly creating multiple boxes

basic font-style-size settings

select tool preset and apply it:

  • + quick
  • + anytime, because applying to whole text is enough
  • - tussle between using a general default for every box, having to pick one every time, or taking the last-used settings

resize

grab corners/sides of box and drag (GIMP, PS)

  • + quick, inside the tool

select transformation tool (Inkscape, Scribus)

  • - leaving text-work for minor adjustmens

move

select move tool, then click

  • - disturbs workflow

select transformation tools, then click on text (Inkscape)

  • + all transformations in one place
  • - disturbs workflow

click and drag anywhere on the canvas, outside the text box (PS)

  • + fast, basic transformations on hand

switch annotations on/off

not possible in GIMP

Creating Original Art

text along path and custom text-box shape

path and text, then "merge. No text-box shape transforms (GIMP)

  • + can be done anytime
  • - text DOES NOT stay editable
  • - order things are done is mandatory: both, text and path have to exist in the first place
  • - also the path has to be selected in the path dialog, though the text is selected on the canvas, to attach one to the other.

first path, then text (Photoshop)

  • + It feels intuitive to move text tool on or inside a path and thereby "attaching" the text to it
  • + one tool to place regular text, attach it to a path or wrap it to a shape
  • + stays editable
  • + warping presets can be applied anytime
  • + nice to define either baseline or box shape in the same way using the path tool
  • + option of flipping text to other side of path/use ascender instead of descender to aline with path
  • - no direct way to later make an already written (and formatted) text go along a path

first path then text with special text along path tool (InDesign)

  • + stays editable
  • + text boxes can be directly transformed by grabbing a corner, etc.
  • - no direct way to later make an already written (and formatted) text go along a path
  • - special tool can only be used on path anyway. PS gives a better solution

path and text, then "merge". Text-box form is part of text properties (Scribus)

  • + can be done anytime
  • + text box shape as part of text properties is really effective
  • + separation of path and text-box form makes sense. However, when making text go along a path the path becomes the form of the text box.
  • - order things are done is mandatory: both, text and path/shape have to exist in the first place

path/shape and text, then "merge" (Inkscape)

  • + can be done anytime
  • + nice universal solution, only the last step ("along path" or "flow into form") differs
  • + text and path always editable
  • - order things are done is mandatory: both, text and path/shape have to exist in the first place

font family and style/variant selection

all-in-one (Inkscape, Gimp)

  • + only one selector needs less menu space
  • + immediate overview of all available font options
  • + 1 click selection
  • - list grows in length by a considerable amount
  • - hard to tell sub-fonts of the same family and different fonts apart

two separate selectors (Photoshop, InDesign, Scribus)

  • + Good overview of families
  • + good for work in one family
  • - users don't see what variants exist, but have to actually select a font to get this information. This takes time when browsing through (Open Type) fonts.


find a middle way

Additional remarks

  • A preview in the font selection tool comes handy and saves time as users can omit unnecessary tryout clicks.
  • An icon showing the font's type (TTF, OT, etc) helps (also visually) when browsing the font list.

native font variant versus variant toggling (?faux)

GIMP At current state GIMP does not behave in any of the ways mentioned above. Buttons for faux (presumably) b./i. exist. The display does not indicate a switch to an existent pre-defined sub-font. Also, the toggle buttons do not have any effect when a respective sub-font hast been chosen. (no double bold). A decision should be taken about the way this works and feedback needs to be give to the user.

no faux bold/italics, only font-integrated options available (Scribus)


faux bold/italics toggles

if implemented an automatic switch to pre-designed (Inkscape) applies a change not in the place where user sets it. At least an indicator should be present.

An explicit faux b./i. switch (Photoshop) seems more intuitive and gives more control to the user (double bold).

transformations of text(-box) (e.g. for perspective)

select desired transformation tool, apply

  • + universal
  • - only applicable to text. box is not an object itself
  • - text is non editable afterwards (only if transformation is undone)

Photoshop

  • simple shape:
    • scaling changes box
    • rotating changes text+box
  • + stays editable
  • complex shape:
    • original shape is copied to a text shape
    • transformations always effect text+box
  • - easy to lose the ability to edit text

Inkscape

  • scaling changes text (and box)
  • rotating changes only text
  • other transformations change text+box

Advanced Typography

Photoshop (and InDesign):

The most basic settings are in a toolbar. For quick typography this does the job. The toolbar also includes a button to open the typography window.

The typography window with it's two tabs and an included menu contains all options available. The first tab shows all settings on a character level, the second one on the paragraph level. The menu hosts all the settings plus a few extra options, like a reset.

Character tab: font family and variant come first. The next section contains metrical adjustmens of font size, leading (line-spacing), tracking (letter-spacing) and kerning. Whereas the former three work on any selection, kerning needs to be adjusted for individual pairs of letters. Therefore the cursor has to be placed between the two letters, to make the the kerning setting accessible.

  • - confusing that entry boxes show unit ( Pt ) but this is not changeable.

The next section allows for vertical and horizontal glyph scaling, plus setting a baseline offset and selecting a text color.

Next comes a row of buttons for toggling faux bold, italics, capitals, small capitals, superscript, subscript, underline and through-line. Last comes a language selector and a drop-down menu to choose hinting.

Paragraph tab: All settings affect the whole paragraph.

First comes a line of alignment buttons. Justification options are greyed out, when text is in a dynamic shape.

The next section allows for setting a first line indent, as well as general left or right indents and spacing before and after the paragraph.


Overall:

  • + the tabs are a functional way of using rare space
  • + tabs provide better overview through structurization
  • + the grouping is mostly understandable


Inkscape:

Inkscape offers a toolbar and an extra window for text-settings.

Extra Window

Editing tab: Plain text

Font tab: Select font family, variant and size. Also alignment, text-flow and line-spacing. A preview is in the bottom line.

Toolbar

font family, no variant (!), size, bold and italics, alignment, super- and subscript. Leading, tracking, spacing between words, kerning, vertical shift, glyph rotation and text-flow.


  • + clear icons
  • + good control for metric settings
  • + glyph palette
  • - distribution of settings


OpenType is only available in Photoshop (basic functionality) and InDesign (extensive functionality). All Options are accessed via a menu in the typography window. They are presented as as on/off switches.

  • + too much for direct access via toolbox
  • - when wanting to select more than one, users have to open the menu again and again.

Checkboxes seem to solve the above issue

tool presets/styles

tool presets (GIMP, Photoshop)

  • + give users the option to customize and build a library of often used settings
  • + integrate well with the rest of the program. Universal solution
  • - users cannot apply them to already existing text, eliminating a big number of possible use cases. In GIMP one can apply them to a selected text, but only to the whole box. (Also, the behavior is not always predictable: Switching between tool presets changes the text orientation. Bug?)

text styles (Scribus, InDesign)

  • + give users the option to customize and build a library of often used settings
  • + always applicable, making it possible to write first and format later with some predefined styles. This gives more freedom.
  • + can be put next to the text settings, giving quick access and making it easy to see they take effect
  • - need toolbox space (toolbox, because they only make sense when quickly accessible)

Inkscape does not save any user settings in the text tool besides setting a default.

Icon Design

glyph palette

not available (GIMP, Photoshop)

  • - A switch to other tools takes time to open the tool and searching the desired font again

Web Images Production

settings not applicable to several texts (unless style-markup exists)


General

placement of tool options

tool options (on side)/ toolbar (on top)

  • + more (all) options on screen
  • + no extra dialog
  • + users can do many changes with one-click
  • - uses space
  • - the options need to be divided, some features (e.g. OpenType features, advanced functions) are put in a menu


extra window (text editor, options)

  • + all of the functionality in one place (at least that's possible)
  • + good overview
  • + focus on textwork makes it especially fast to work with
  • + comes handy in cases where effects/layouting disturb editing.
  • - Having some of the formatting options only available in external dialog (Inkscape) is bad for the workflow.
  • - Changes are not in the context of the work (no live update on canvas)

GIMP currently uses a combination of toolbox, extra window and heads-up-display

  • + separable radius of effect: toolbox for whole text-box, hud for selected text.
  • - above also presents difficulties:
  • - in none of the three, ALL options be found
  • - a checkbox does not seem the right way to start the text-editor

Analysis

In GIMP there is:

  • Text, which has no container.
  • Vector object containers



starting points

dynamic shape fixed basic (rectangular) shape fixed (any) vector shape
aims/scenarios click'n'type

workflow

text centered

small amounts of text

non-strict layouting

area/shape is not an object as itself

layout centered = placement control

prevent/control intereference with other objects on canvas (boundaries)

use box as a shape (the box itself is s.th.)

justification


generally broad variety of aims

free art vs. exact layouting

interaction with rest of canvas

definition one corner (e.g. two sides) are defined all four sides are defined.

when reaching the right side, text is wrapped

when reaching the lower side, text runs out of the box and is visually clipped

same as in fixed basic shape
creating click + enter text,

sets start point of baseline

resulting "shape" is always rectangular

click + drag

? convert rectangular vector shape + enter text?

  • create text shape vector specifically for it
  • use existing vector
    • copy it -> text shape vector
    • clone it -> text shape vector that reflects changes on vector of origin
modifying resize -> becomes fixed shape

in-text layouting might modify shape

rotate

  • text only (changes box anyways)

move

stroke/fill

convert to fixed shape

convert to vector shape

resize shape (alters line breaks)

rotate

  • text only
  • shape only (changes to vector shape mode)
  • text + shape (changes to vector shape mode)

move

stroke/fill

convert to dynamic shape

convert to vector shape

resize shape (alters line breaks)

node manipulation (alters line breaks)

rotate

  • text only
  • shape only
  • text + shape

move

any other transformation applicable to vectors

stroke/fill

conversion to dynamic shape (e.g. unbind from vector)

not possible to make basic shape


two subcases of the dynamic and fixed basic shape are missing from this analysis.

  • a fixed basic shape, that does not clip: lines over the bottom of the box are not clipped. Rather, the box is extended.
    • workaround: this can easily be achieved by vertically resizing the box
  • a fixed basic shape, that does not wrap: text runs out of the right side of the box, but is invisible outside the box. only manual line breaks cause new lines. However it is clipped at the bottom of the box
    • workaround: if wrapping is a property of text on a paragraph level (by default set to positive), this can be turned off. In combination with a fixed shape it allows for a replication of above case.

conclusion: these special cases can be replicated with existing means. A native implementation would complicate the system too much and is much less appealing than the simplicity of the current implementation.

holes/wrapping around vectors

text can not only be inside a vector shape but also around a vector shape. Of course, it still needs to have one of the above containers. The concept of wrapping text around a vector is a bit different to the one use in word processing as in GIMP it is not simply a property of the vector object. Users need to be able to explicitly control which text instances the vector object influences.

  • property of the vector object
  • linked to as many instances of text as wanted
  • also vector shapes serving as text containers can have this property towards other text instances

specific text-shape objects for complex shapes?

For complex shapes the question arises whether it is the original vector object that contains the text, or if a copy of it as an specific text-shape is better suited.

pro original vector:

  • unified approach
  • no doubling of tools
  • creating + later modyfing are the same
  • changing vector means changing text shape. This is especially important, as this starting point implies a close binding of text to the canvas setting.
  • if users want to losen this binding, a simple copy of the original vector is easily created

pro specific text-shape

  • independence of vector
  • possibility of adding text-specific controls

container for complex shapes?

a rectangular container around complex shapes provides advantages

  • specification of left and right
  • provides a good way of keeping original vectors as shapes while still providing text-specific controls to it thereby adressing some of the points above.

along path/from path

Text along path (correct name: baseline along vector): A vector is created first, and then existing text elements are linked to it or a new text is entered along the vector. Direction, start and end point are adjustable.

Also a new mode, namely start margin along vector is needed. It dissolves the standard of parallel baselines (1). It might also be used as an alternate way of rotating text. (e.g. a straight diagonal vector) (2) and is combineable with any (vector) shape (3).

(1) Margin vector.png (2) Margin rotate.png (3) Margin vector shape.png

see also: Geometry of text placement

Transformation

the leading question is whether or how these transformations affect the box, the text or both. a distinction has to be made between transformations that alter the shape of the text-box but leaving the glyph-shapes intact and transformation that affect the glyphs (e.g. 3D-perspective). Users need control over the scope of the transformation.

resizing

resizing of text+box is on the one hand intuitive and context oriented, but on the other hand it violates full typographical control. Also when for example dragging the corner of a text box one does not grab the contained text, thus maybe does not expect it to change.

rotation

for rotation the picture is a bit different: Here one would expect box and text to rotate simultaneously, e.g. the box is seen as the orientation for the text. The text is "aligned" to it. Yet (and especially for vector shapes) a rotation of either one, shape or text, is needed.


The new GIMP handles for resizing/transforming could be useful. (compare: student team 1 )

presets/styles

a set of user-saved settings needs to be applicable (1) after creating a text-element and (2) to parts of a text-element. Both is not possible with current tool-presets. Whether text should reflect later changes in the according style is subject to discussion, but probably out of GIMP's focus.

control/menu behavior

editor

The editor gives one-click access to a plain view of the text. All layouting apart from line-breaks and justification (both depending on the size of the text-element) needs to be visible.

Any intermediate abstraction from the image (e.g. turning the background off, but keeping the abstract shape of the text element) can be realized by the user via the layers dialog.

User can always switch between text-editor and canvas editing and changes made in the editor need to be displayed live on the canvas. Also the editor is the place where users shouldn't miss a single bit of text-functionality.

Toolbox, Editor and HUD

Current status: The toolbox settings do not consider a selection made. This makes sense in the logic of treating the text-element as a whole but easily gets in the way of formatting. Also the HUD (for applying changes to selected text only) does not contain all options.


Analysis of the three editing modes:

Toolbox HUD Editor
purpose main place for tool settings

on canvas work without getting in the way

quick access

undisturbed workflow

experimenting

plain view

undisturbed by canvas

proximity of text to options

scope full functionality restricted to basics


full functionality
implementation lack of space

grouping of features (e.g. justification type).

  • The button can present the current state.
can disturb the view:
  • trigger on/off
  • appear on mouseover
  • opacity of about 50%

affects space for transformations

quick switch via a button/shortcut

displays only in-text-layouting. shapes are not visible

live update of changes on the canvas

ordering of functionality reflects the toolbox

enough space, no grouping necessary


OpenType features are plentisome: Cannot be present on first level menu (maybe it suffices to have them in the menubar). However, they need to be accessible in a checkbox-manner to allow for quick switching on/off of multiple OT features.

A simple glyph palette should provide manual access to all a font has to offer

misc

  • bold/italics could be named "manual bold/italics" and always do this. Professionals know about the possible existence of sub-fonts.
  • stroke text or basic effect like drop-shadows should be shared with the new vector-tool. Text is nothing else than vectors.

font family and variant selection

Alternative: two-step selection with variant as a sub-menu

  • + only one selector needs less menu space
  • + Good overview of families
  • + browsing feels quick
  • + one click selection
  • - user don't see what variants exist (Mouseover helps)
  • - difficult to handle

effects/transformation and boundaries

Current situation: when transforming text it loses its text-property but is nevertheless still limited to the size of the original text, which was used to layout the text (as a layer boundary) (the purpose for limiting the text area may be very different from the one for limiting a layer to a certain size)

In the future this issue will gain further importance by text being always editable (and therefore layouted by the text-engine). A transformation of glyphs or stroking them alters the visual size of the text. Line-breaks and wrapping (also in advanced text-element shapes) are calculated based on the dimensions of the glyph.

scope of text-tool

IN

  • typography or more broadly: in-text-layouting
    • character and paragraph level
    • preset functionality and behavior
    • OpenType implementation may need to be postponed
  • editing modes
    • editor, on canvas, HUD
    • level of abstraction
  • basic shape
    • non-shape, rectangle
    • creation
    • modification
  • text in 2D-space
    • needs logical specification
    • needs ui implementation, how to make the two tools work together
    • dependencies: vector tool, GEGL (for non-destructiveness)


OUT

  • annotations
    • differ in many dimensions to usual text:
      • need to be turned on and off quickly
      • have no need for most of the formatting options
      • could profit from being searchable
    • very close to meta-information, which is out of the vision for text in GIMP
    • = are better managed by its own system
  • complex shape/vector management
    • creation and modification of complex shapes and paths is exactly what the new vector tool is made for
    • doubling it in the text-tool…
      • …overloads the text tool
      • …uses space and control used for text-specific work
    • a link between text and the shape should do the job
    • = should be done in vector tool: unified approach
  • text effects
    • drop shadow etc. are not unique to text
    • useful for different sorts of objects (e.g. any vector)
    • workflow is "select object" - "apply effect", no matter if it is special to text or a global effect
    • = unified approach suits it better

Current state

see Work_in_progress#Text_in_GIMP for current state