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05/31/2011 11:09:24 AM · #1 |
I have noticed that when I crop an image it doesn't remain at 300 dpi. I could almost swear that this is a recent change to how my Photoshop CS5 crops. I don't remember the resolution changing in the past. I save all of my finished jpegs at 300 dpi and I've never had to check to ensure that the resolution hadn't been lowered and changed from 300 dpi.
Maybe I inadvertently changed a setting. If so, then I'd like to change it back. How can I ensure that my images automatically remain at 300 dpi after cropping? |
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05/31/2011 11:49:30 AM · #2 |
DPI coded into the file is irrelevant. It is only an abstraction until a piece of paper becomes involved. The only real DPI is when you physically put that image onto paper and squeeze X number of dots into every inch. Does not matter what is coded into the file. Rather than go over it again, I will take the lazy man's route: Here is a prior discussion on the subject of DPI from a couple of years ago.
Message edited by author 2011-05-31 11:52:14.
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05/31/2011 11:54:55 AM · #3 |
Before I go to that link, my response to physically putting that image onto paper is that I prefer to set the resolution to what I want to print at prior to saving it and later reopening it for printing.
I have learned a heck of a lot here over the years but the gaps in my knowledge base are enormous sometimes.
Now, off to that link. Thanks. |
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05/31/2011 12:06:20 PM · #4 |
Originally posted by yakatme:
I prefer to set the resolution to what I want to print at prior to saving it and later reopening it for printing. |
The issue there is you could take two images, say a 100x100 icon and a full size 12 megapixel image and print them both at 300dpi. The icon will be 1/3 inch in size and the larger one will print at about 14 inches. If you squeeze or stretch the image to fit, then you are changing the DPI that you are printing at. This is why it is an abstraction until it is placed on paper. (The resolution the printer is capable of printing at is another aspect that complicates things, but for the sake of argument, lets assume it can print at whatever you tell it to.)
If you truly want to print at a given DPI, then you need to figure out what the desired print size will be and resize the pixel size of the image to fit properly on that paper at that resolution.
It can be a tough concept to wrap one's head around. Since I work in the copier/printer business, I have an understanding from the printer side as well, so that has helped me.
Message edited by author 2011-05-31 12:09:15.
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