In reply to Mark Ingram I am going to do a reply in two parts to attempt to illustrate the resampling of pixels in the Absolute Size Crop Tool function. Have sized an image to 4500 px by 3000px to easily show the pixel number changes more easily. First image set as 15in by 10in at 300 DPI with pixel crop 4500px by 3000px. Second image 15in by 10in at 50 DPI with pixel crop now at 750px by 500px.
Third image at 15in by 10in and a large DPI of 3000 and pixel crop now 45000px by 30000px. This is action for changing only the DPI when a dimension such as inches is selected. Does not happen when only pixels are selected.
So does that mean you're using Lanczos 3 Non-Separable for this resizing? If so, that's fine for me. If I need something sharper I could always add some sharpening myself. And possibly just documenting the resampling method would suffice. Thanks.