In Aseprite, you can change the transparency (Alpha channel) of pixels within a selection using the Replace Color feature. Based on the provided steps, this method is particularly useful for making selected pixels fully opaque while preserving their color.
Here is a breakdown of the process:
Step-by-Step Guide to Changing Selection Transparency (Making it Opaque)
This method utilizes the "Replace Color" dialog to target and modify only the Alpha channel of the pixels inside your active selection.
1. Select Your Area
First, you need to define the pixels whose transparency you wish to change.
- Use any of Aseprite's selection tools (e.g., Marquee Tool, Lasso Tool, Magic Wand).
- Pro Tip: You can quickly select all existing pixels on a specific layer by holding Ctrl and clicking on the layer thumbnail in the Timeline/Layer editor.
2. Access the Replace Color Feature
Navigate to the menu options.
- Go to
Edit>Replace Color. - This will open the Replace Color dialog box, which allows you to define criteria for replacing colors within a specified range.
3. Configure the Replace Color Settings
This is where you specify that you only want to affect the transparency (Alpha) and make it maximum (fully opaque).
- From Color: The color defined here doesn't significantly matter for this process when only Alpha is checked. You can leave it as the default or pick any color.
- To Color: Similarly, the color part of the "To" setting is less important when only Alpha is being changed. Set the Alpha value of the To Color to maximum (typically 255 for 8-bit alpha). This ensures the selected pixels become fully opaque.
- Channels: This is crucial. Uncheck the R, G, and B checkboxes. Leave only the A (Alpha) checkbox checked. This tells Aseprite to only modify the transparency value of the pixels, not their color.
- Tolerance: Set the Tolerance slider to maximum. This ensures that the change is applied to all pixels within your selection, regardless of their original color or alpha value.
4. Apply the Change
Once the settings are configured, apply the changes.
- Click the OK button in the Replace Color dialog.
Aseprite will then process the pixels within your selection, setting their Alpha value to the maximum value specified in the "To Color" (making them fully opaque), based on the high tolerance and A-channel-only setting.
Summary Table: Replace Color Settings
| Setting | Value/Action | Purpose |
|---|---|---|
| From Color | Any (Doesn't matter for Alpha-only change) | Define target color range (mostly ignored here) |
| To Color | Any Color, but Alpha set to Maximum (255) | Define the target transparency value |
| Channels | Uncheck R, G, B; Check only A | Restrict changes to only the Alpha channel |
| Tolerance | Set to Maximum | Apply change to all selected pixels |
This method, derived from the provided steps, is a specific way to modify the transparency within a selection, primarily used for making areas fully solid.
