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Crop Image's trim (object.cropImage {trim: true}) decoded the image
within MAX_RASTER_ALLOC (2 GB) and then converted it to RGBA. The
decoder holds the decoded image, before conversion, to that allowance,
so a gray or 1-bit image within it could take up to four times as much
once converted.
Trim now reads the image's size from its header first and, when
width × height × 4 is over the allowance, fails before anything is
decoded, with the check and message Load Texture uses: "an image of
W × H pixels is too large to draw". Images within the allowance are
trimmed as before.