steve_gray3 Posted October 23, 2003 Share Posted October 23, 2003 Hi all, I searched the archives but could not find a definition of this and see it often in this group. I know what a crop is but what exactly is a 100% crop?? Many pictures posted here are reffered to as 100% crops but I don't really know what that means. Thanks Link to comment Share on other sites More sharing options...
KenPapai Posted October 23, 2003 Share Posted October 23, 2003 It doesn't mean anything. Either the image is as-is (as shot without any cropping) else it's cropped. I cannot think of a reason whwere "100% crop" is meaningful. Sounds like extra, redundant words. Link to comment Share on other sites More sharing options...
digitmstr Posted October 23, 2003 Share Posted October 23, 2003 On the contrary it DOES mean something very important. It means that the portion of the image shown is 100% the size (pixels). This is useful when doing resolution tests, etc... Often time you see this in lens reviews where the writer shows a portion of the picture (crop) at its original size (100%). Link to comment Share on other sites More sharing options...
bill_goldman Posted October 23, 2003 Share Posted October 23, 2003 I too have found the term confusing and ambiguous. As I understand it, it means that a portion of an original picture (which has not been cropped or resized) is being displayed and since the term is generally used for digital images, the cropped portion has not undergone digital processing except as noted. It's a practice used to illustrate the performance of a lens so it often shows the center, edges or corners of the original picture. So, in a sense, I guess it means cropped from the original 100% picture. If I am wrong, someone please enlighten me. Link to comment Share on other sites More sharing options...
hyunyu Posted October 23, 2003 Share Posted October 23, 2003 100% crop--my understanding is that oftentimes digital images have more resolution than what can be displayed on the screen. For example--a 6 megapixel image is 3000x2000. However, most screens can display 1280x960 or 1024x768 or 800x600. So, when you display a 6mp image on those screens, the viewing program will shrink the image to fit. You can see the actual image size by zooming into 100% viewing magnification. 100% crop is a portion of the image at 100% magnification cropped to show a certain area. It's useful when comparing the picture qualities of different cameras. For example, a 100x100 pixel portion of a 6mp image (3000x2000) compared to a 100x100 pixel portion of a 1.3 mp image (1280x960) will give you a good idea of how the two cameras' images compare, much better than seeing a 3000x2000 and 1280x960 shrunk to fit the monitor's 800x600 resolution. Link to comment Share on other sites More sharing options...
KenPapai Posted October 23, 2003 Share Posted October 23, 2003 Now THAT makes sense. I've posted a 100% crop then (a recent sunrise). I did not think of it that way but of course that's the correct set of answers above. Link to comment Share on other sites More sharing options...
ron c sunshine coast,qld,a Posted October 23, 2003 Share Posted October 23, 2003 i easily understand the 100% crop thing but get massively confused over displayed pixels,screen resolution,dot pitch etc. Link to comment Share on other sites More sharing options...
steve_gray3 Posted October 23, 2003 Author Share Posted October 23, 2003 Thanks for the answers! I'm going with Hyun Yu and Giampero's explanations. They are kind of what I suspected was the case and make the most sense. If I got it wrong please let me know. Thanks, Link to comment Share on other sites More sharing options...
PuppyDigs Posted October 23, 2003 Share Posted October 23, 2003 It means a small portion of a larger image file has been extracted and displayed at monitor resolution, e.g., 72dpi. I find viewing images at pixel level photographically useless but many have derived hours of enjoyment and endless forum debates. Stop down and use a tripod and any cheap kit lens can produce a razor sharp 6 x 10" print when a 3072 x 2048 file is printed at 300dpi. But a 640 x 480 crop from the same file displayed at 72dpi looks fuzzy and gritty (duh). Sometimes the light’s all shining on me. Other times I can barely see. - Robert Hunter Link to comment Share on other sites More sharing options...
david_jones16 Posted October 24, 2003 Share Posted October 24, 2003 I agree that this term is slightly confusing, especially to non digital users. But I think everyone seems to get the jist of what it means, or is supposed to mean as they have explained above. However, isn't the "100%" tag a little superfluous? If a (digital) image is merely cropped, then there is no reason why the remaining section should also have been resized. It's the resizing which will affect the proportional pixels per inch/cm compared to the original file/capture as a representation of the subject, not the cropping. I nominate the acronym "URCOF" instead: un-Resized Crop of Original File. Alternative, we could just use the traditional term for this.. A Crop! :-) Link to comment Share on other sites More sharing options...
digitmstr Posted October 24, 2003 Share Posted October 24, 2003 It sounds confusing :) but the 100% refers to the display size in pixels. The crop refers to the portion being shown compared to the size of the picture. For ex. let's say you made an 11x14 print to test your new Photo printer and wanted to check a small portion of that print. You would cut a 2x2 piece out and examine it. That would be a 100% (you have not changed the original size of the print) size of a section (CROP) of the print. Link to comment Share on other sites More sharing options...
yakim_peled1 Posted October 27, 2003 Share Posted October 27, 2003 Just wonder why this question is in this forum ? It isn't EOS related. Happy shooting , Yakim. Link to comment Share on other sites More sharing options...
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