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09/16/2005 03:12:42 PM · #1 |
| Is upping the dpi in image size the only way to do it? For some reason it says 600 dpi in photoshop but when i upload it to dpcprints it says it is only 83 dpi. Can anyone offer any advice? |
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09/16/2005 03:15:17 PM · #2 |
Go to Image then Image size. Or Alt+Ctrl+I. This changes the pixel dimensions but I think it's what you were talking about. You make the image smaller it will be fewer dpi. Eventually...
Message edited by author 2005-09-16 15:20:22.
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09/16/2005 03:16:14 PM · #3 |
dpi is of concern only when printing. As long as the pixel dimensions are suitable for whatever you're doing you don't need to worry about it.
The dpi can be changed in the crop tool as well.
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09/16/2005 03:18:06 PM · #4 |
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09/16/2005 03:26:01 PM · #5 |
| thanks...I will go look at that link cos I really am confused by this. |
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09/16/2005 03:37:05 PM · #6 |
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09/16/2005 03:49:06 PM · #7 |
Web display of images "maps" pixels 1:1 on the screen. It is thus independent of any DPI you might assign the image. If your image is 640 pixels wide (as uploaded) it will display in a space 640 pixels wide on your screen. If your screen is set to "display resolution" of 640 pixels (absurdly low) the image will fill the screen from side to side. If your screen is set to 1280 resolution (much more common) the image will fill half the screen from side to side. Set the screen display to 2560 resolution, and the image will fill one quarter of the screen from side to side. It makes NO difference how many "dots per inch" there are in the image because the display software doesn't know from inches, it only knows pixels.
On the other hand, if you want to PRINT, consider this: Take an image that is 1000x1000 pixels in size. Specify the resolution to 100 dpi and the print will come out at 10x10 inches. Set it to 1000 dpi and the print will come out 1x1 inches. Contrariwise, tell the printer to make the image 10x10 inches and you will get a 100 dpi image. Without your changing the dpi in photoshop youself.
The purpose of dpi settings in photoshop is that specific printers have specific dpi settings that work best for them, and any excess pixels in the image are not going to improve the resolution; indeed they may actually harm it because of "confusion" issues. So if you take an image that's 3,600 pixels wide and tell the printer to "reduce" it to a 6 inch print, that would be 600 dpi. Tell the printer to make it 12 inches wide, that would be 300 dpi.
If your printer could only resolve to 300 dpi, then you'd be better off changing the resolution and size in photoshop, where you can control the way the image is rendered at that size, and delivering a true 300 dpi, 6-inch version directly to the printer to be rendered by it at 100%
DPI is absolutely irrelevant to DPC display quality; all that matters is pixel dimensions.
Robt.
edit: wondering if I should have just read John's link? Probably said all I have said better/more accurately :-)
Message edited by author 2005-09-16 15:51:31.
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09/16/2005 03:49:54 PM · #8 |
dupe post
Message edited by author 2005-09-16 15:51:41.
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09/16/2005 03:53:22 PM · #9 |
Originally posted by bear_music:
dupe post |
Looks like you are in "auto-reply" mode Robert:)
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09/16/2005 03:55:15 PM · #10 |
I wanted to edit my own post and made it a "reply" instead of an "edit" by mistake :-)
R.
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09/16/2005 04:13:00 PM · #11 |
Originally posted by bear_music:
I wanted to edit my own post and made it a "reply" instead of an "edit" by mistake :-)
R. |
I do that all the time -- just hit the browser's "Back" button before you do anything else. What's worse is how easy it is to Report your own post : ) |
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09/16/2005 05:07:26 PM · #12 |
| Thankyou. I think it was the ratio that turned out to be the problem as well. I had it on constrain proportions and I think that affected it. Thanks bear your explanation, it made it a lot clearer. I think I understand it all a lot better now. (although..probably wouldn't pass a test on it just yet!). The light on this subject is getting a little brighter though! Thanks again! |
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