---
ID: ISSUE-005
Type: Issue
Status: Resolved
Priority: High
Labels: [bug, core, image-processing]
Created: 2025-04-22
Updated: 2025-04-22
Related:
---

# [ISSUE-005]: Alpha Mask channel not processed correctly

## Description
When processing source images that contain an alpha channel intended for use as a MASK map, the tool's output for the MASK map is an RGBA image instead of a grayscale image derived solely from the alpha channel.

## Current Behavior
If a source image (e.g., a PNG or TIF) has an alpha channel and is classified as a MASK map type, the resulting output MASK file retains the RGB channels (potentially with incorrect data or black/white values) in addition to the alpha channel, resulting in an RGBA output image.

## Desired Behavior / Goals
When processing a source image with an alpha channel for a MASK map type, the tool should extract only the alpha channel data and output a single-channel (grayscale) image representing the mask. The RGB channels from the source should be discarded for the MASK output.

## Implementation Notes (Optional)
(This requires modifying the image processing logic for MASK map types to specifically isolate and save only the alpha channel as a grayscale image. Need to check the relevant sections in `asset_processor.py` related to map processing and saving.)

## Acceptance Criteria (Optional)
*   [ ] Process an asset containing a source image with an alpha channel intended as a MASK map.
*   [ ] Verify that the output MASK file is a grayscale image (single channel) and accurately represents the alpha channel data from the source.
*   [ ] Verify that the output MASK file does not contain redundant or incorrect RGB channel data.