Photolab cropped my 1x1 square ratio to 5269 x 5251.
Error : An exact 1:1 ratio should have been produced.
Hi, Pierre! I understand this is strange and unwanted behavior. However, it’s hard to know what the problem is without knowing the steps needed to arrive at it.
There are a lot of discussion topics in the forum that address incorrect crop ratios. This is in part because there are many ways to arrive at the problem and address it. For example, if you’re using Volume Deformation correction, you need to apply that before perspective/horizon and crop corrections or you’ll end up with some strange results such as a wrong crop ratio. DxO is not going to fix this behavior. If you drag the edges of a crop area, you’ll end up with inaccurate calculations due to image zoom and PhotoLab’s built-in tolerances (i.e., it takes a lot of adjusting before PhotoLab will tell you a crop ratio has changed). This, too, is acceptable to DxO.
If you think you’ve found a bug, report it at support.dxo.com. You’ll have to provide the steps needed to reproduce the problem.
Looks like you’ve got a 
or two … 
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Hi Greg !
yes, I have reported the bug. It happens when using perspective correction with cropping.
Very funny !!! I stopped counting bugs
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Crop ratio issues have been around for a while and many posts have addressed the topic.
For most precise crop aspects
- drag a corner (or several corners) until you get the right ratio and/or size
- then move the crop frame to where it needs to be.
Note that certain ratios don’t do pixel perfect ratios easily.
If you, e.g., want a crop ratio of 5 : 7 , PL will approximate the ratio, unless the number of pixels can be divided by 5 and 7 respectively. Example: A 5:7 crop with a 1024 short dimension should be 1024x1433.6 … and you’ll get a ratio that is NOT EXACTLY 5x7 because pixels are either there or not.
The numbers in the OP are way off though. I recommend to set crop after any other geometric operation.
Note: The same ratio considerations apply for export. Even a perfectly aligned 5:7 crop will not export with that ratio if size is set to e.g 1024.
In this case, the setting is for square, that is 1:1 ; there is no reason that the height and width should be different
perspective correction changes the ratio.
George