Cropping images to exact pixel sizes

I'm a Photoshop user but being a recent Mac convert I'm having a go with the Aperture 2 trial.
I'm a bit confused about how to crop an image to an exact pixel size. I've watched the video tutorial several times over but I still can't achieve what I want. So ...
* My original image is 2816 x 2112
* I select a 4 x 3 aspect ratio using the Crop HUD
* I pull the rectangular box out to take in the section of the image I want to crop out of the original
* I want a finished image of 500 x 400 pixels
* I go to the Crop field in the Adjustments tab and change Width to 500 and the Height to 400
* The crop area on the image ends up as a small box in the bottom left hand corner and when I hit Return, all I end up with is that area of the image inside the box when what I want is the originally selected crop area but at 500 x 400 pixels
* If I stretch the rectangular box out to cover the original area, the pixel dimensions go up again beyond 500 x 400
Which part of the process am I missing?
Thanks for anyone's advice,
Mark

What you type in that box is just the ratio not the actual pixel number. And the box does not like to many digits in there. A ratio of 4 x 5 would work perfectly fine in your case, but more complicated ratios like 21 x 50 don't work.
To get 500 x 400 px you must then export your image with settings that restrict your image, eg, to fit into a 500 x 500 px box.
The idea behind this two-step approach is that you might think of 500 x 400 px output right now, but by doing the actual pixel generation at a later point, you can always easily export later at 1000 x 800 px if you need a higher resolution version with the same aspect ratio.

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Cannot crop to an exact pixel dimensions

I am having a hard time cropping to an exact pixel dimensions upon export. For my work, I need to crop to exactly 2166X1600, with a tolerance of no more than one pixel off of those dimensions, i.e. 2166X1599.
I set crop tool to 2166X1600 and crop all of my images. On the export I constrain to largest dimension of 2166 in both horizontal and vertical directions. Results vary widely from right on 2166X1600 to several pixels off on the short side. Sometimes more than 1600, and sometimes less. Any thoughts as to why these constraints do not work exactly? Some sets of images I have to redo as many as 25% of a gallery of 200-300 images. Any thoughts? Thanks!

See, I don't need to crop the original image to 2166X1600. I need a finished image at 2166X1600. Meaning, in theory I should be able to crop an image to 1:1.35375 ratio, which is 2166X1600, and export to constrain to 2166 on the longest side. When it's constrained to 2166, the short side should always be 1600.
Here's where the problem is... When you set the crop window to 2166X1600, you expect that when you size your crop on your image that the only options for the boundary are multiples of 2166X1600. In reality, the crop visual boundaries are approximate. Here's an example...
I have an image that I have cropped to a finished size of 3185X2350. Which is based upon a 2166X1600 crop. When I export it, I need the 3185 to become 2166. So the long side is constrained to 2166, and it is reduced by a factor of 1.47. 3185/2166=1.47 If I reduce the short side, 2350, by that same factor of 1.47 you end up with a short side of 1598. Which is why I have a problem.
My invalid assumption was that when you set specific pixel dimensions in the crop tool, that only those values would be shown in the crop tool's bounding box. Photoshop can do it...

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What you type in that box is just the ratio not the actual pixel number. And the box does not like to many digits in there. A ratio of 4 x 5 would work perfectly fine in your case, but more complicated ratios like 21 x 50 don't work.
To get 500 x 400 px you must then export your image with settings that restrict your image, eg, to fit into a 500 x 500 px box.
The idea behind this two-step approach is that you might think of 500 x 400 px output right now, but by doing the actual pixel generation at a later point, you can always easily export later at 1000 x 800 px if you need a higher resolution version with the same aspect ratio.

Exact pixel width in crop

Is there any way to crop to an exact pixel width in Develop mode?
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Am I missing something? This seems like such a basic parameter for cropping, more so than aspect ratio, which is well respresented.

I need exactly 440 pixels because that is the exact size that fits in my blog - a technical consideration and also very much a stylistic/publishing one, so that all the images on the blog are the same width. I imagine all layout artists must usually work to these kind of size constraints.
As long as the image is large enough (in pixel terms) I can crop it "artistically" any way I like (eg 2534 x 1679 pixels) and then export it at 440 pixels width and that's fine. This is exactly what I do in many, indeed most, circumstances, and any half-decent photo will of course be larger than 440 in width, so no problem there.
The problem arises when the subject matter (usually a distant bird) is smaller than 440 pixels width and yet I want to show as much detail as possible on my blog. It'll be a "record shot" usually of something quite uncommon for some reason - so I guess that would fall much more into the scientific or technical camp. Then I don't want to shrink the exported image at all as the subject matter is quite small enough already at full size. That's why I have to crop it to exactly 440 pixels wide (the height really doesn't come into it). Neither do I want to enlarge the image to 440 pixels as there's really no point and I'll end up with even blurrier pixels.
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When you crop, is it normal for the MPs to reduce?
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Thanks for the explanation, it was very helpful
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Il giorno 11/nov/2014, alle ore 17:00, Vikas.Sharma <[email protected]> ha scritto:
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