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MaxPreps requires up to crop the images to 3000 x 2216 pixels. If I only do that, the image will export to about 5mb. They also want us to check the resize box, and enter 3000 for the long edge. But when I do that, it reduces the file size to about half the size, or 2 to 3 mb. Why is that if it's already cropped to the same size that I'm telling it to resize to? Thank you.
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Note, that it is advisable to crop in LrC to the ratio that matches the desired export crop size, as to avoid interpretation issues.
Oh and some reference material (not complete)
And what I found about MaxPreps
from that:
Do you have a link for requirement 3000x2216 pixels? I have never used this service.
I do see that they sell photos in small medium or large, and large is 3000x2216, so that it would make sense to upload to MaxPreps at 3000x2216 (and site will produce down samples).
I also see in other peoples inquiry's about how to crop/resize in Lr, in LrC, in PS (largely not in the Adobe community, yours appears tobe the first) Always refer to 3000x2216
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Thank you very much. That makes total sense now.
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So in summary-
1) A Crop in LrC is to change the Ratio of the visible image 'shape' or aspect ratio- For 3000:2216 you would need a Custom Crop-
2) In the Export dialog is where you define the Pixel Dimensions of the exported derivative image file.
3) The megabyte size of the new file is determined by several factors-
-The Pixel Dimensions of the exported image defined in [Image Sizing]
-The 'Quality' of the Compression (that gets applied to a JPG file) in Export [File Settings].
-The amount of detail in the image subject. (eg. a photo of tree leaves compared to a blank sky)
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Thanks Rob. I get it now. Huge help!