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11-14-2012, 04:50 PM   #1
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Definition of "100% Crop"

I see constant reference to "100% Crop" in many lens tests. What exactly is the definition and how do I go about making a 100% crop of an image?

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11-14-2012, 05:00 PM   #2
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It's essentially a crop of an image which hasn't been scaled. So the pixels you see are the same as in the original photo.

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11-14-2012, 05:53 PM   #3
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It's basically as Adam said.

In whatever software you use you'll have a scale option (25%, 50%, 75%, 100%, Fit to screen, etc)

When you set that to 100% it's showing the image at full size (neither zoomed in, nor out)
Because cameras nowadays take large photos, at 100% you'll only see a bit of the image, it will generally be more than twice the size of the screen.


A 100% crop is basically using the crop tool to cut out a section of the image that's small enough to use elsewhere without needing it to be zoomed in or out
11-14-2012, 10:12 PM   #4
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A more accurate description would be "full-resolution" crop.


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11-14-2012, 10:48 PM   #5
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100% magnification is where 1 screen pixel = 1 image pixel.

In your image editing application, view => 100%

Then use the crop tool on whatever section of the image you wish to show at 100%
11-15-2012, 09:45 AM   #6
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OK, see if I understand correctly? If my screen resolution is, say 1920 x 1080 (which it is), if I set my crop tool to 1920 x 1080 and crop an image with larger dimensions, the resulting section of the image will be a 100% crop?
11-15-2012, 10:00 AM   #7
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QuoteOriginally posted by John279 Quote
OK, see if I understand correctly? If my screen resolution is, say 1920 x 1080 (which it is), if I set my crop tool to 1920 x 1080 and crop an image with larger dimensions, the resulting section of the image will be a 100% crop?
We're making things too complicated here. A 100% crop means a crop from an image that has not been re-sized. My camera gives me images that are 4672 x 3104 pixels. That's a pretty big size for looking at on the computer so if I wanted to post it online, I'd re-size it--say to 1168 x 776. A 100% crop from that image would be a crop made *before* the image was re-sized. It would allow someone to have a glimpse of part of the image at full resolution. You would do this maybe if you wanted to show someone how sharp your lens is without having to upload a huge image.

I recently sold a lens here on the marketplace. I've posted a 100% crop to show what the lens can do. https://www.pentaxforums.com/forums/sold-items/201848-sale-sold-super-multi-c...mm-f2-8-a.html

11-15-2012, 11:42 AM   #8
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Everyone is correct but let me take a shot at saying it differently.

When you view an image on your screen at "actual size" and then crop a portion of that very large image you have a 100% crop. I do like and agree with what stevebrot said above.
11-15-2012, 03:19 PM   #9
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QuoteOriginally posted by hks_kansei Quote
it will generally be more than twice the size of the screen
Your gonna just need to get yourself a 27" screened iMac, as I dive for cover.
11-15-2012, 03:34 PM   #10
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What if you cropped a section of a full-size photo - for example, the crop is 1500x1250 in size. If I resized that crop down to 1024x768 or to a smaller size for posting on the forums, it's no longer a 100% crop? Or would that just be considered a resized 100% crop?
11-15-2012, 03:53 PM   #11
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QuoteOriginally posted by paulh Quote
What if you cropped a section of a full-size photo - for example, the crop is 1500x1250 in size. If I resized that crop down to 1024x768 or to a smaller size for posting on the forums, it's no longer a 100% crop? Or would that just be considered a resized 100% crop?
The entire point of 100% crop is that it shows the pixels at 100% size. So any resizing means it's no longer a 100% crop.

If I took an image and cropped it, and I uploaded it to a site that resizes it, I would just say it's a cropped image. Not a resized 100% crop That's just so unwieldy.
11-15-2012, 04:15 PM   #12
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A 100% crop...

Name:  _IGP1890 - Version 2 (1).jpg
Views: 1135
Size:  304.0 KB

That's it. Nothing special.
11-15-2012, 04:21 PM   #13
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QuoteOriginally posted by JinDesu Quote
The entire point of 100% crop is that it shows the pixels at 100% size. So any resizing means it's no longer a 100% crop.

If I took an image and cropped it, and I uploaded it to a site that resizes it, I would just say it's a cropped image. Not a resized 100% crop That's just so unwieldy.
Got it - thanks. I have a knack for unwieldy-izing the wieldy
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