Disclosure: This draft was generated with AI and checked against the cited primary sources, with a separate AI editorial review. It was prepared for the FrameSprite team, which has a commercial interest in FrameSprite. Proposed examples are not executed tests unless explicitly identified as recorded fixture results.
An Aseprite Background layer cannot contain transparent pixels. Clearing part of it replaces the selected area with the active background color. If an imported AI character turns white, black or another solid color when you erase its backdrop, check the layer type before changing the eraser or repeating the selection.
Key Takeaways
- A Background layer is structurally opaque; it is different from a normal layer with opaque artwork.
- Converting the layer permits transparency but does not automatically identify or remove the painted backdrop.
- Verify an exported PNG over contrasting colors, including holes inside the silhouette.
Identify which surface you are clearing
Save a native copy before editing. In the timeline, select the cel and layer containing the imported character. Hide other layers temporarily. A normal transparent layer above an opaque background can produce the same solid-looking composite, even though erasing the upper layer works correctly.
The official Layers documentation distinguishes the opaque Background layer from transparent layers and documents Layer > Convert To > Layer. Use that conversion on a working copy when the character itself needs transparent surroundings. Do not use the reverse conversion: converting to Background fills transparent areas.
If the layer is already normal, inspect what lies underneath it. Also check the document's color mode using the Color documentation. An indexed-color limitation is a separate diagnosis; changing layer type does not promise every opacity operation will behave like an RGBA painting document.
Remove the backdrop without removing the subject
After conversion, make a small test selection in a corner containing only backdrop and clear it. Hide all lower layers. The test region should now reveal the editor's transparency display. Undo that test if it cuts into important artwork, then choose the removal method appropriate to your source.
For a flat background, select connected backdrop areas while watching similarly colored clothing. For a textured or shaded background, a single color selection may remove parts of the character or leave a fringe. Work in sections and keep an untouched source layer hidden beneath the repair copy. Aseprite's conversion changes storage capability, not image segmentation.
Here is a proposed check, not a performed editor test: an inventory helmet contains a black visor against a black backdrop. Converting Background to Layer is necessary for transparency, but selecting all black pixels would also erase the visor. Isolate the connected exterior and inspect the visor separately. This decision prevents a successful cutout operation from destroying an intentional interior detail.
Inspect the delivered file independently
Use the export workflow to create a PNG with a distinct output name. Reopen that PNG in a separate document. Place a bright layer underneath it, then a dark one. Check exterior corners, gaps between a weapon and the body, and any open rings or handles.
| Observation | Next check |
|---|---|
| Every cleared area stays opaque | Layer type, visible lower layers and export composition |
| Corners are transparent but the visor is missing | Removal selection included subject pixels |
| A gray checker pattern is visible in the PNG itself | Source contains painted checkerboard pixels |
A checkerboard in a viewer is not evidence of stored alpha by itself. Deliberately changing the layer underneath distinguishes a viewer background from actual artwork. Do not add another color-removal pass merely because a viewer uses a dark canvas.
For neighboring problems, see indexed layer opacity limits, baked checkerboard diagnosis and black or white sprite fringes. Accept the cutout only after the subject survives and the exported transparent regions reveal both test backgrounds.
Written by the FrameSprite Workflow Team. Report a documentation correction.
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