Difference between revisions of "Work in progress on histogram redesign"

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(What should be available)
(Design draft)
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TODO: on-canvas vs. sidebar toggles
 
TODO: on-canvas vs. sidebar toggles
  
TODO: toggles interaction and design
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TODO: toggles interaction
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TODO: outline view vs filled view for separate channels
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TODO: other design considerations?
  
 
TODO: enabling info section in the dialog or via dialog menu
 
TODO: enabling info section in the dialog or via dialog menu

Revision as of 13:44, 8 July 2017

Problem statement

  1. Current channel selection options are limiting: one cannot have Blue+Luminance, or just RGB without Value/Luminance.
  2. Choosing a channel in the histogram dialog requires two clicks: opening a combo box, then choosing a channel.
  3. The info section of the dialog isn't always necessary, but takes precious vertical space.
  4. Versions 2.9.x and 2.10 make the histogram dialog design even busier by introducing linear/gamma-corrected switch that has no obvious on/off state (at least, with some UI themes).

Better solutions can be devised, as seen in other software (see 'Tentative design' section).

What should be available

  • easily accessible (e.g. on-canvas for the histogram area) switches: R, G, B, Alpha, Value/Luminance/L*, Linear/Log scale, Linear Light / Gamma-Corrected space
  • a toggle to show/hide the info section about selected area of the histogram

TODO: We need to decide if we should expose color channels from other color spaces such as CIE LCH. We already expose LCH channels in color selection tools, and exposing LAB / LCH in e.g. Curves tool/filter makes a lot of sense, so this needs a decision.

TODO: Do we stick with Value/Luminance or go for L*?

TODO: Do we really need the file name on top of the histogram? We keep it for the multi-window mode, but dockable dialogs don't use this approach uniformly, so it doesn't look like it's a consistent design decision.

Design draft

TODO: on-canvas vs. sidebar toggles

TODO: toggles interaction

TODO: outline view vs filled view for separate channels

TODO: other design considerations?

TODO: enabling info section in the dialog or via dialog menu

Tentative design

darktable

  • can display any combination of R, G, and B channels
  • always displays L*
  • has a linear/log/wavelength switch
  • displays basic photography-specific metadata
  • allows tweaking blacks and exposure by dragging histogram zones

Histogram-darktable.png

RawTherapee

  • can display any combination of R, G, B, and L* (CIE LAB) channels
  • can display chromatic hsitpgram
  • has a toggle for raw/processed histogram
  • has a linear/log switch
  • has an optional narrow panel where it displays values for R/G/B/L* under the mouse pointer

Histogram-rawtherapee.png

Adobe Photoshop

  • Has verbosity toggle in the dialog's menu:
    • Compact View (just the histogram, nothing else);
    • Expanded View (histogram, channel selection, info section);
    • All Channels View (histogram, channel selection, info section, R histogram, G histogram, B histogram).
  • Has a toggle to display R, G, or B channels in monochrome mode.
  • Displays intensity level under mouse pointer when hovering histogram widget and updates Count respectively. Selecting a portion of the histogram is available as well.

See https://helpx.adobe.com/photoshop/using/viewing-histograms-pixel-values.html for more information.