Edit palette - indexes selection, color and transparency

[user0]

XnViewMP 1.6.4 64bit
Windows11 (23H2), display resolution 3840x2160, win scaling 150%

Edit palette dialog
slightly improve functionality

Suggestion
Basic

• png
  • add save/edit support for all transparency variations via tRNS chunk

Extended

• edit
  • add functionality to select and modify multiple indexes
    eg select multiple indexes via ctrl/shift+mouse/arrows and press enter to edit colors or del to delete indexes
    • set color/alpha
    • delete index
  • add control to modify 'Edit Index' action (double-click), it can be:
    • checkbox - 'Edit Alpha channel' OR
    • radio button - to switch between RGB and Alpha

• unique colors
  • add functionality to see unique colors (eg via tabs: Indexes, Unique colors), so it is possible:
    - to see which colors are unique
    - to modify them affecting all related indexes

• sort palette
  • add functionality to sort colors in palette (see sorting in Aseprite)

    

Mockup
pending..



Example

• UI comparison

  

Related

• suggestions
  Viewer - png - tRNS transparency - add save/edit for all variations
  Edit palette - indexes selection, color and transparency (current post)
  App UI - menu structure - View - improve channel commands