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06/12/2005 01:06:16 PM · #1 |
Anyone know why the exif info on my camera says a DPI of 180, but when I open the image in photoshop to change the size for printing, it's 72?
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06/12/2005 03:08:41 PM · #2 |
I believe photoshop defaults to screen resolution, which is silly but they do it anyway. The resolution is meaningless unless printing.
That said, and not being familiar with your camera, it may be placing them at a resolution that allows for printing directly. It would make it a lot easier for the common person to pull the card and stick it in the machine at wal-mart.
David
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06/12/2005 09:59:12 PM · #3 |
Thanks, but I still don't get it. SHouldn't the DPI of the file stay the same unless I change th image size?
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06/12/2005 10:02:18 PM · #4 |
Originally posted by louddog:
Thanks, but I still don't get it. SHouldn't the DPI of the file stay the same unless I change th image size? |
what format are you opening the pic in? If you are taking it in raw then converting it you can set it to the res you want. the 72 is default & doesnt make any sense but you still should have a large enough image to increase the res safely eithout distortion.
Also, tiff to jpeg is also an issue as ur editing program might do some compression before opening it. What are you using?
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06/12/2005 10:04:13 PM · #5 |
it does stay the same... it's setting the dpi differently but it's also changing the size in inches that it's saying. Don't worry about it, it doesn't affect your quality in any way.
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06/13/2005 12:26:00 AM · #6 |
DPI is a meaningless figure in relation to sizing an image. The only significant figure is the number of pixels in the image. The number of pixels horizontally x the number of pixels verically = total number of pixels (PHxPV=PT). If your image has 2000x1000 pixels recorded, you have 2,000,000 pixels in the image.
If you make the canvas size be 20x10 inches, that's 100 pixels per inch. Make the canvas 40x20, that's 50 pixels per inch. Make it 10x5, that's 200 pixels per inch. Assuming you resize the image without resampling it. Each of these images contains precisely as much information as the next.
Try it yourself; go to "image/image size" and uncheck the "resample image" box. Type a new dimension in the horizontal dimension box, and watch the pixels-per-inch value change.
Robt.
Message edited by author 2005-06-13 00:27:03.
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06/13/2005 01:04:43 PM · #7 |
Thanks! Now I understand.
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06/13/2005 02:33:11 PM · #8 |
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