Crop not actually cropping and deleting, problematic when using AI Denoise filter

Question

I have an image, 3240x1350 px, guides enabled at three columns (making a seemless panorama for instagram).  I add an image, resize it appropriately, crop to canvas size, delete cropped pixels checked.  I hit enter, image crops, all good.  I then go to Filters and AI Denoise and click.  AI does its thing, and when finished, it has denoised the entire original image, and compressed the entire original image height into the new canvas height, giving the effect that the image has been squashed and looks terrible.  No matter what I try, the issue persists.  No matter how I crop, the AI Denoise filter somehow gets a hold of the original image then crams it into the new canvas size.e

Conrad_C · Answer

FYI, out of curiosity I tried this with my own images, and am able to reproduce the problem: If a layer has larger dimensions than the canvas and AI Denoise is applied, for some reason the AI Denoise result squishes the entire layer dimensions within the canvas dimensions. This is wrong and @Aleke should probably convert this to a bug report.

Tested in Photoshop 27.1.0 20251117.r.17 2758080

If you don’t need to preserve separate layers, a quick workaround is to choose Layer > Flatten Image. This has the side effect of trimming any pixels extending past the canvas edge. Then apply AI Denoise. Now the AI Denoise result should be both faster (by no longer having to process pixels outside the canvas) and should correctly fit the canvas without distortion.

If you do need to preserve the separate layers, instead of flattening the whole document, choose Image > Trim. In the Trim dialog box it probably doesn’t matter what Based On is set to, but definitely make sure all four sides under Trim Away are selected, then click OK. That removes all pixels extending past the canvas on any layers.

However, Trim might not work as expected in the file shown in the video. That’s because the selected layer was imported as an embedded Smart Object according to its icon on the Layers panel. The Trim command can’t affect pixels encapsulated in a Smart Object. If you want it to, then before using the Trim command, select the Smart Object layer and choose the command Layer > Smart Objects > Rasterize (or, the command Layer > Rasterize > Smart Object works just as well). Then you can apply Trim and AI Denoise.

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