The Crop Tool assumes you want to resample your image when you specify the sizes in physical units and provide a ppi value, so it derives your aspect ratio from the size fields and sets the crop boundaries to have just that aspect ratio, but covering as much of the image as is possible. Is this what you're seeing?
If you really want it to crop to a particular fixed pixel count, without resampling, a better approach would be to define your "half page" preset in terms of horizontal px x vertical px units.
Thanks for the response... but:
1. When my rulers are set to cm...
2. My crop dimensions are in cm...
3. And i've given the ppi as 300 ppi...
I refuse to see why i should now give the dimensions in pixels as against cm - especially considering there's no change in the document's ppi. Moreover, the behaviour is the same whether i define a ppi count or not...
Noel, to answer your question, what i expect from a predetermined size is that the crop box is at that size. Therefore, allowing me to only have to position the image so that i get the part of the image i want without having to 'fiddle' with the crop box controls/handles.
This, as i've mentioned, is not happening.
Perhaps i'm getting the wrong end of the stick where presets for the Crop Tool are concerned...
Further Noel... just tried setting the predetermined box in pixels... same problem...
What seems to happen is that the largest dimension reverts to the image boundary, while the smaller dimension crops into the image. This despite my setting the ppi to 300 - the same as the image's ppi.
The way i look at it, when i set a predertimed size, the crop box should be at that size... particularly, as you suggested, when i have pixels selected as my dimensions. And my rulers are also set to pixels.
The latest attempt as follows:
1. Image size is 20.32 x 26.14cm @300ppi (2400x3087 pixels)
2. Crop size is set to 1831 x 2776 pixels (ppi setting enabled to 300 and rulers are also in pixels)
What happens is the crop box defaults to the full height of the image and crops in at the sides. Info box shows: W:1831, H: 2776. But it's encomapssing the full 3087 pixels (height) of the original image.
The way i look at it i should get a crop box that is smaller than the image and now should be able to move the image around to gt th crop i want. This way i still have to crop into the image and it's then resampling the image.
I have to agree with you in that case (specifying pixels), but I guess that's just not the way they made it work. I suppose the idea is that they expect you to always interactively choose how much of the image you want retained - that's in keeping with the way it's always worked.
Frankly, I too had thought it would work the other way when pixels are specified (and no ppi value entered), though I should have tried it myself. Sorry about that.
This could be another option for you, possibly, if your image is flat...
Make the image a layer, choose Image - Canvas Size, and select the (smaller) size you want. Then move the image around in the canvas with the Move Tool.
Yup... that's a workaround... but does slow down work as 'Canvas size' has no preset.
Guess, as usual, it's a case of so far but failing at the last 100ft of connectivity!
BTW, as long as you're working with a layer or several layers this works... only the background gets totalled. (Referring to the 'Canvas size' option for others - so as to avoid any confusion.)
Yes, I was thinking about being able to move the layer around, but of course you can select multiple layers and move them all together.
You might want to describe what it is you'd like the Crop Tool to be able to do over on the feature request site: