Got it, let's work through this problem step by step. The key here is to reverse-engineer the color tweaks applied to your modified texture, then apply that exact same transformation to your target DDS—no need to guess the original brightness/saturation settings. Compressonator falls short here because it's built for compression optimization, not precise color math, so let's use tools that handle the color ratios correctly:

First: Prep Your DDS Files #

Most DDS textures use compressed formats (like DXT1/DXT5) that can mess with color calculations. Start by converting your original, modified, and target DDS files to a lossless format like PNG. Any image editor (Photoshop, GIMP) or command-line tool (ImageMagick) can do this—just open the DDS and export as a 32-bit PNG to preserve full color detail.

GUI Workflow (Photoshop or GIMP) #

This is the most intuitive method for visual control:

• Step 1: Open your original texture (original.png) and modified texture (modified.png) in your editor.
• Step 2: Generate the adjustment mask:
  • Place modified.png as a layer directly above original.png.
  • Change the blend mode of the modified layer to Divide. This reverses the color adjustment mathematically—since modified = original × adjustment, dividing modified by original gives us the exact factor needed to replicate the tweak.
• Step 3: Export the combined result as adjustment_mask.png (save as 32-bit PNG to avoid precision loss).
• Step 4: Apply the mask to your target texture:
  • Open target.png, then add adjustment_mask.png as a layer above it.
  • Set the mask layer's blend mode to Multiply. This applies the same brightness/saturation changes that turned the original into the modified texture.
• Step 5: Convert the adjusted target back to DDS, using the same compression settings as your original files to keep consistency.

Command-Line Automation (ImageMagick) #

Perfect if you need to batch-process multiple textures:

1. Convert DDS files to PNG (skip if you already did this):

   magick original.dds original.png
   magick modified.dds modified.png
   magick target.dds target.png
   

2. Generate the adjustment mask:

   magick modified.png original.png -compose Divide -composite adjustment_mask.png
   

3. Apply the mask to the target:

   magick target.png adjustment_mask.png -compose Multiply -composite adjusted_target.png
   

4. Convert back to DDS (match your original compression, e.g., DXT5):

   magick adjusted_target.png -format dds -define dds:compression=dxt5 adjusted_target.dds
   

Key Notes to Avoid Issues #

• Why Compressonator failed: It’s designed for optimizing DDS compression, not calculating proportional color transformations. The divide/multiply blend modes preserve the exact ratio of color changes, which is what you need for consistent brightness/saturation tweaks.
• Stick to 32-bit PNGs: Using 8-bit files will introduce banding or incorrect color ratios that break the adjustment.
• Match DDS compression: When converting back to DDS, use the same format (DXT1, BC7, etc.) as your original textures to prevent unexpected artifacts or file size bloat.

内容的提问来源于stack exchange，提问作者haker146