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DPChallenge Forums >> Hardware and Software >> Photoshop cropping problem
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 08/25/2012 08:46:56 AM · #1
so this is weird, if I set the crop area to say 5x7 the crop looks appropriately small on the picture area, but if I switch it to 7x5 then it seems to take up a good portion of the image, like maybe 70-80% of the area. Am I missing something?
 08/25/2012 09:11:53 AM · #2
Pictures. Pictures would be good. :)
 08/25/2012 09:12:42 AM · #3
Originally posted by vawendy:
Pictures. Pictures would be good. :)


hehe ok let me see....
 08/25/2012 09:17:24 AM · #4
ok here we go, is it the software or just my own perspective that is skewed?

5x7


7x5
08/25/2012 09:35:20 AM · #5
Your problem comes from the fact the crop tool (in both PS and LR) uses ratios, not sizes themselves directly.

You have to choose sizes yourself (in pixels, inches, cm, ...) if you want to compare horizontal and vertical crops of the same dimensions.
- In PS CS6, in the new crop tool, chose "Size & Resolution" in the drop down menu.
- In PS (all versions) you can also use the rectangular marquee tool, choose "fixed size" and enter your values, then Image->Crop
- In LR it can't be done as far as I know.

edit:typos.

Message edited by author 2012-08-25 09:37:01.
 08/25/2012 09:38:40 AM · #6
What looks different (smaller) in the image? The image or the model in the image?

When I opened the images you posted in CS4 and set the view to 'actual size', the images are identical in length/width from a pixel perspective.
 08/25/2012 09:43:23 AM · #7
Based on those last 2 comments maybe I just need to learn more about how it works :)
 08/25/2012 09:50:38 AM · #8
Look at it this way: if the ORIGINAL format of your image were 4x6 as it comes from the camera (that is a 4x6 horizontal) then it wouldn't have to crop at all to get that ratio; but if you wanted a 6x4 (a vertical shot) you'd have to crop a LOT off the image to get that. And this is what's happening; anytime you turn a horizontal into a vertical, it's an extreme crop. Turning a horizontal into a different-ratio horizontal is always less extreme of a crop.
 08/25/2012 11:03:23 AM · #9
with regards to learning how it works. Try lynda.com. Well worth a months membership. took some ps tutorials. you can also find the info on the web for free, but not necessarily as well consolidated.
 08/25/2012 11:27:12 AM · #10
Take a photo printed 8x10 on a nice piece of paper. If you want to put it in a 5x7 frame, you'd take a pair of scissors & cut (or crop) 3 in. off each edge, so it would fit.

Same piece of paper, only now you want to hang the frame in portrait orientation. This time you'd crop 1 in. off the top, & 5 in. off the side, to make it fit.

In photoshop, you can choose to magically shrink the 8x10 until it's 5x7. Same aspect ratio, all the information is there, it's just a smaller size.

With the photoshop crop tool, if you want portrait orientation, you can shrink the 8 to a 7, & crop the 10 to a 5 at the same time.

I hope this helps. It's one of those things that's easy to understand but hard to explain.
 08/25/2012 12:29:03 PM · #11
Resizing Pictures to Standard Print Sizes (DPC Tutorial)
 08/25/2012 03:23:00 PM · #12
Originally posted by Bear_Music:
Look at it this way: if the ORIGINAL format of your image were 4x6 as it comes from the camera (that is a 4x6 horizontal) then it wouldn't have to crop at all to get that ratio; but if you wanted a 6x4 (a vertical shot) you'd have to crop a LOT off the image to get that. And this is what's happening; anytime you turn a horizontal into a vertical, it's an extreme crop. Turning a horizontal into a different-ratio horizontal is always less extreme of a crop.


this is what i mean tho, on a 5dmk2 cropping the image at 7x5 it shouldn't take up so much of the image, and when I crop at 7x5 and then goto image\image size it shows it as 20inches or so....
off to read tutorials i guess

as i read i am starting to think that is not what it seems

Message edited by author 2012-08-25 15:25:46.
 08/25/2012 03:33:36 PM · #13
4x6, 8x12, 16x24, are all the same PROPORTION, see? The actual SIZE is whatever you want it to be within the constraint of those proportions.

Suppose the image is 4000x6000 pixels; print that at 100 ppi (pixels per inch) and you have a 40x60 inch print. Print it at 200 ppi, you have a 20x30 inch print. At 400 ppi, it would be 10x15 inches. That part's all in what you tell the printer to do.

Your image has an absolute size only in terms of the number of pixels it contains. It has an absolute proportion (before cropping) that is the ratio of the long side and the shorter side, and THIS is what we refer to when we talk about "cropping to a 5x7 ratio".
 08/25/2012 03:51:04 PM · #14
Originally posted by Bear_Music:
4x6, 8x12, 16x24, are all the same PROPORTION, see? The actual SIZE is whatever you want it to be within the constraint of those proportions.

Suppose the image is 4000x6000 pixels; print that at 100 ppi (pixels per inch) and you have a 40x60 inch print. Print it at 200 ppi, you have a 20x30 inch print. At 400 ppi, it would be 10x15 inches. That part's all in what you tell the printer to do.

Your image has an absolute size only in terms of the number of pixels it contains. It has an absolute proportion (before cropping) that is the ratio of the long side and the shorter side, and THIS is what we refer to when we talk about "cropping to a 5x7 ratio".


I don't know why I don't just email you directly every time I have a question, I guess it's incase you get tired of me LOL. I get it perfectly now, as long as i know that when I put 7x5 or 10x8, 12x8 into the crop properties thats what it will be optimized for then i am good....
 08/25/2012 05:09:17 PM · #15
In Elements it's an optical illusion. If I crop in a portrait format and then fit to screen it will look totally different than if I crop to a landscape. When I hit view - full screen the portrait will look smaller due to screen ratios even though they are the same pixel height.

Even if saving and comparing the two in a normal viewer it remains the same, they are resized to fit the screen and the portrait mode will look smaller.
 08/25/2012 08:10:13 PM · #16
When you are viewing an image in Photoshop, especially if you are evaluating the effects of sharpening, you should always view at 100% or an "even fraction" (50%, 25%, 12.5%, 200%) or you will get display errors as "fractional pixels" get interpolated.
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