Originally posted by Tjompen1968 Many comments say "Don't pixel peep" or "Don't look at the images at 100%"
Those comments only apply when you are using the whole sensor output. If you have to crop the image you are suddenly alot closer to the 100% problems.
If these problems will be seen on a print or not depends on the printed resolution, i.e the amount of pixels at your disposal. If cropped tight, they will show.
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I agree that you may need to look at 100% view for things such as sharpening.
However it must be remembered that at 100% view you are looking at a screen representation of your image where 1 pixel from your sensor is being represented by 1 pixel from your monitor - this always results in you seeing an image that is bigger than a normal print and is dependent on your monitor PPI.
Most current standard monitors have a resolution of around 100 PPI therefore if you are viewing an image at 100% view and your output device is a Canon/HP printer then your screen view is 3x print size and will show all artifacts much magnified.
If you want to view at print size in this case you would be looking at using a zoom of 33.33%, but this presents its own problems. FIrst PS and other software resizing algorithms can present problems with these partial reductions leading to misinterpratation of image data. Second your (standard) monitor does not have enough resolution to display fine detail correctly (it would need 300 PPI to do this for Canon/HP type printers)
The problem is not just related to cropping an image but the requirements in PPI of your output device for the size of that image - at some point there will just not be enough pixels to represent fine resolution. This will occur using the full sensor as well as a crop