Features

[wilecoyote2015]

Manipulation

• r,g,b press and then mouse drag to move along primary axis
• same for chrominance, saturation, brilliance, luminance
• This should also be possible in image view: press appropriate key above any pixel to mode corresponding lut entrie(s)
• subdivision (tetrahedral?) -> should preserve hue, saturation etc. especially on middle axis
• R/G/B and luma curves (Their guI will reset after each interaction with other tools. But ensure that reset is reversed when undoing that interaction)
• When dragging a point on some (color) axis and neighborhood-editing is enabled, drag the neighbors on the same axis!
• Handle LUT border regions properly while editing! (user-selectable if preserve hue etc.). E.g. if manipulating multiple nodes at once via hue, ensure that movement alway only occurs in the manifold where only hue changes, but no other parameters.

Interaction

• neighborhood-editing: Modifier + mouse wheel during drag to scale interaction range with neighboring lut nodes. Appropriate coloring of weights should be displayed in the LUT
• Neighborhood editing should also be able with not a 3d neighborhood, but only neighborhood regarding some color axis (same hue, saturation etc.). E.g. select red and then have (and modify) neighborhood of lut entries of similar hue. Maybe provide option to scale neighborhood at multiple axes independently.
• When having an entry selected or changing neighbor range, a mask of affected pixels must be displayed in the image view.
• Option to preserve central axis (greyscales) with neighborhood-editing
• Click + mod on image pixel to select nearest lut entry

GUI

• Image View
• Option to load a reference image (handle color space!). There, colors can be picked from a pixel, and a marker in 3d lut view is created, indicating where the desired color is located. Scaling selection with cursor as center should be üossiböe
• Undo / Redo!

Misc

• Lua script for darktable to open exported and raw image in lut editor?

[wilecoyote2015]

Es sollte fuer alle parameter (HSV, HSL. HCL, RGB) und vielleicht zusaetzlich kontrast und gamma etc. slider fuer +- geben, die immer auf die selektion angewendet werden. slider einer colorspace-gruppe bleiben, auch wenn ein anderer der gruppe bewegt wird, weil das ja orthogonal ist. Darueber ist dann auch das mit sem gesamten LUT von oben (kurven) abgebildet, wenn man einfach alle punkte selektiert.

[wilecoyote2015]

selection from image: Click on pixel selects all nodes that influence the pixel. shift click expands selection accordingly. pressing a transform key (r,g,b,h,s,l,v,c,) selects all nodes that influence a pixels of same hue, saturation etc. CTRL click selects the single node with the strongest influence.

Maybe better: mark the pixels selected via double click in the image. Have sliders to expand the selection across the individual axes. So, on double click, the selection is not performed directly, but the selected pixel values are stored, and the selection may be changed on the fly. On slider change, resulting influence of selected nodes should be shown. Determine final selection on transformation start and on any trigger of showing the weight in the image view.

[wilecoyote2015]

in 3d LUT view, holding the modifier not used for multi selection on an empty space shows the influence of all selected nodes in the image. hovering with mouse over a node shows the influence of that node.

[wilecoyote2015]

there should also be a shortcut for "scaling" the selected nodes to their common origin to make them the same / more similar color.

[wilecoyote2015]

box select in lut view is also important (with and without z clipping)

[wilecoyote2015]

option to reset selected nodes

[wilecoyote2015]

when transforming by mouse drag using color dimension shortcut, transform is controlled using horizontal mouse drag. curently. during transform, enable pressing a second color dimension shortcut in order to use the vertical mouse drag to control this dimension, so that 2d-drag is possible.

[wilecoyote2015]

show bounds of lut cube with axes

[wilecoyote2015]

shift + a to select / deselect all

[wilecoyote2015]

selection presets -> Need ability to save project.