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12-29-2009, 04:54 PM   #1
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How to make 100% crop

I was wondering if someone could give me a basic explanation of how to make a 100% crop that I can upload when demonstrating things like details and sharpness. I'm using Photoshop Elements 8.

12-29-2009, 05:04 PM   #2
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Someone wrote an online pixel peeper application to do that:

Weblightbox

Dan.
12-29-2009, 05:06 PM   #3
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It's nothing more than cropping the portion you want demonstrated to the point that the portion's actual size appears on the screen.
12-29-2009, 05:21 PM   #4
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Whatever you copy/cut from the original photo is at 100%. Say you have a 3000pix x 2000pix image. You mark an area. Say you highlighted an area 1/100th of the image i.e 300x200, You crop to this. Now use SaveAs (not "Save", unless you want to overwrite your orignal version with a cropped one) and give the crop a new name. If you want a second bit from the same image reload the original image (or Undo, but I think a SaveAs may clear the Undo buffer). As long as you don't resize the 300x200 crop, it will still be at 100% (same size as the same part in the original), and upload it as a JPEG, you'll be fine.

Dan.


Last edited by dosdan; 12-30-2009 at 12:01 AM.
12-29-2009, 06:36 PM   #5
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In Lightroom:
  1. Create virtual copy
  2. In the Develop module, use the crop tool to frame the section of interest and double click to execute the crop. If small enough, the crop should display as 1:1
  3. When exporting, be sure that the exported pixel dimensions are the same as the dimensions of the crop (no resizing).
This is pretty tedious and inexact. In practice, I generally do a cropped screen capture from LR's 1:1 view using Paintshop Pro.

Edit: Changed the instructions so that they really work.

Steve

Last edited by stevebrot; 12-29-2009 at 09:32 PM.
12-29-2009, 07:30 PM   #6
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Make sure the saving is done at maximum quality

nconvert -q 100 -crop <left> <top> <width> <height> -o <output-file> <input-file>

- Itai

PS: Get nconvert from xnview.org
12-29-2009, 07:53 PM   #7
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not needed

Last edited by Eaglerapids; 12-31-2009 at 09:29 PM.
12-29-2009, 08:03 PM   #8
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Nconvert's not easy to use for cropping, unless you're using a fixed crop location for all images. It much easier doing it in XnView instead. Say you want to get a 100x100 crop out of a number of images.

1. Load the first image.
2. (one-off) create a custom selection range: Edit | Set Selection Size | Custom. Enter w:100; h:100.
3. (one-off) Click on "Save selection as custom"
4. Drag the section square to where you want to sample
5. Either click on Crop or use the shift-X hotkey.
6. Either use SaveAs (Ctrl-Shift-S) or Export (Ctrl-Alt-S). I prefer the later because you can preview the quality reduction as you move the Quality slider for JPEG. In this case though you want Quality=100.
7. Either click on the File Next icon or press PgDn to move to the next file.
8. Press C to bring up the saved custom (100x100) selection area...

If you don't want a fixed crop size, it's easier. Just click-and-drag the mouse over an area and click Crop.

Dan.

Dan.


Last edited by dosdan; 12-29-2009 at 08:28 PM.
12-29-2009, 09:24 PM   #9
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QuoteOriginally posted by Eaglerapids Quote
Stevebrot, I have never understood this.
I create virtual copy
I go to 1:1 mag
but then when I click on the crop tool the view doesn't stay on the 1:1 is goes back to the full frame, what in the world am I doing wrong?
So it does! I have not done a 100% crop for a long time using LR. (I usually use Paintshop Pro.)

I will modify my instructions so that they really work!

Steve
12-29-2009, 09:39 PM   #10
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not needed

Last edited by Eaglerapids; 12-31-2009 at 09:28 PM.
12-29-2009, 09:53 PM   #11
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Last edited by Eaglerapids; 12-31-2009 at 09:28 PM.
12-29-2009, 10:00 PM   #12
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Last edited by Eaglerapids; 12-31-2009 at 09:28 PM.
12-29-2009, 11:29 PM   #13
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Doesn't one just go to the magnification tool and pick "actual size" meaning 100% and just crop any portion you want since the image of whatever portion you are cropping is already in 100% view?
12-29-2009, 11:39 PM   #14
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QuoteOriginally posted by dosdan Quote
Whatever you copy/cut from the original photo is at 100%.
This isn't necessarily true. What if you want a 200% crop, or more?

In Lightroom you can choose which percent you want to view. Does it make a difference it the window is full screen or not?
12-30-2009, 12:10 AM   #15
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QuoteOriginally posted by GerryL Quote
Doesn't one just go to the magnification tool and pick "actual size" meaning 100% and just crop any portion you want since the image of whatever portion you are cropping is already in 100% view?
No, it's not the level of current viewing magnification when you crop it (you could be zoomed in 400%). It's the fact that no resizing occurs. So your cropped portion contains the same number of pixels as there were in that section in the original shot.

Say the original 12Mpix photo had one person in it. Out of the 12Mpix, you just want his head. In the original shot, that part contained 667Kpix (say 1000h x 667w). Your crop of just his head is 1000h x 667w and still contains 667Kpix, so no resizing has occurred. So when you pixel peep at this crop you've seeing this portion at its original (100% of sensor output) size, even if you zoom in or out.

Dan.

Last edited by dosdan; 12-30-2009 at 12:25 AM.
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