How much do you crop
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08-07-11, 08:30 AM
Join Date: Aug 2009
Location: Surrey, Hampshire, Berkshire border
I think you are correct in your assumption. As you say, my crop box is in relation to the aspect ratio of my 500d image sensor*. I don't start with a crop box of a specific dimension. Once I've set the dimensions in the crop menu, I just click and drag across my image, and shunt and move the crop box around until I'm happy and then double click. But I always end up with a cropped image that is 800px wide by 533px tall, no matter how much I move the box or drag the crop box corners.
*The 533px is a bit of an odd looking number, but I came to it by taking an image from my camera and resizing the whole image so that the longest side was 800px, I clicked the maintain aspect ratio box and then made a note of the other dimension, which was 533px.
I don't know if this is the correct way of doing these things, but it seems to work for me.
I've now used my resizing method with an image from my Wife's Lumix and an image from my Daughter's CoolPix and the dimensions for both of their cameras should be 800px x 600px.
I just conducted a little experiment. I've just overlaid a 800px x 533px crop over a 800px x 600px crop of the same image (one from my Daughter's camera) reduced the transparency of one layer, and can see that there is quite a difference between the two crops. So you are absolutely correct in that the aspect ratio of the crop/resizing is dependant on the image sensor size.
Thanks for bringing it to my attention (and making my head hurt) :-)
EDIT: OK, I've just redone my experiment, but set two vertical guides to crop to, to make sure I'm cropping the same thing with both crop sizes. I pasted both the 800x600 and the 800x533 onto different layers, changed the opacity of the top layer and the images sit perfectly one over the top of the other with no distortion. So now I'm a bit confused.
Last edited by nick_gray; 08-07-11 at
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