Function blobFromCanvas

blobFromCanvas(
    canvasOrId: CanvasOrId,
    format?: "png" | "jpeg",
    jpegQuality?: number,
): Promise<Blob>
Encode the full RGBA contents of a canvas as a PNG or JPEG Blob.
- 'png' (default): lossless; alpha is preserved.
- 'jpeg': lossy, typically smaller. JPEG cannot carry alpha — transparent pixels are composited against a background before encoding. Use PNG if you need alpha.
Parameters
- canvasOrId: CanvasOrId
  Canvas element or its DOM id.
- format: "png" | "jpeg" = 'png'
  'png' (default) or 'jpeg'.
- jpegQuality: number = 0.9
  0..1 quality for JPEG encoding (default 0.9). Ignored for PNG.
Returns Promise<Blob>
The encoded Blob, or null if the canvas is not found or encoding fails.
- Defined in util/canvas.ts:166