Replacing image with Indexed Color Mode results in transparent color being drawn

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
lua
Domain
computer-graphics, desktop

Research direction

Reproduce the report with the NxScale.lua script, UR64N_N3.aseprite, and Aseprite v1.2.18 using the linked Package.zip. Investigate how replacing the scaled image handles transparent pixels in Indexed Color Mode, then verify that transparency remains correct without requiring a save and restart.

Written by the indexing model from the issue text.

Description

Steps to reproduce with Aseprite v1.2.18:

  1. Add NxScale.lua script to Aseprite.
  2. Open UR64N_N3.aseprite.
  3. Use any scaling algorithm on the image.

Issue:
For scaling a new image is created and the original one is replaced by It. Pixels that were previously transparent are now drawn on the image.

Workaround:
If you save the result and restart Aseprite transparent pixels will be drawn correctly.

Package.zip

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