Resize Document ignores resampling algorithm in Photo (Mac desktop 1.9)

[jcmunoz]

Hi,

After updating to Photo 1.9 (desktop app on a Mac), I've noticed that the Resize Document option ignores the selected resampling algorithm. I open my document (a simple raster image, just one layer), go to Resize Document, make sure Resampling is selected, choose a resampling algorithm, and enter the new document dimensions in pixels, preserving the aspect ratio. I've tried all algorithms, and the resized images are all identical regardless of the algorithm I choose.

This happens both when upscaling and downscaling images. I've confirmed that the pixel size does indeed change. And the images are identical down to the pixel, not just slightly different; I've confirmed this by comparing them with the blend mode set to difference.

When up/downscaling by an integer factor, the result always looks like the nearest neighbor method was used. If the rescaling factor isn't an integer then it looks like the bilinear algorithm was used.

This only happens when resizing the document. When exporting the document into a file then the differences between the various resampling algorithms clearly show up.

Has anyone else experienced this problem? Thanks,

Juan Carlos

[lepr]

Sounds like the "simple raster image" is an Image object rather than a Pixel object. Resize Document will always non-destructively scale the Image objects of a document, whereas it will destructively resample the Pixel objects when the Resample option is enabled. An Image object can be converted to a Pixel object by the Layer > Rasterise command and then the Pixel object can be resampled by resizing the document.

[jcmunoz]

2 hours ago, anon2 said:

Sounds like the "simple raster image" is an Image object rather than a Pixel object. Resize Document will always non-destructively scale the Image objects of a document, whereas it will destructively resample the Pixel objects when the Resample option is enabled. An Image object can be converted to a Pixel object by the Layer > Rasterise command and then the Pixel object can be resampled by resizing the document.

You're absolutely right, thanks! I hadn't paid attention to the layers tab where indeed it's clear that it's indeed an image object and not a pixel one. This fixed it, thanks!