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08/10/2003 10:32:09 PM · #1 |
I use paint shop pro 7 and I need to find out how many dots per inch my image is to make sure it's okay for dpcprints (If I have images that will work, I might obtain a membership).
I can click on image information and it tells me how many pixels per inch there are, but I don't think that's the same, is it?
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08/10/2003 10:37:05 PM · #2 |
yeah, that should be the same. DPI is just "dots per inch" and most times "dots" and "pixels" are interchangeable.
:) |
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08/10/2003 10:38:13 PM · #3 |
Yes, those should be exactly the same. Dots-per-inch and pixels-per-inch are often used interchangeably, although they should not be. In the graphics industry, there are four distict parameters referred-to as "dots-per-inch."
If you can find the actual NUMBER OF PIXELS in the image, divide that by 150 to get the maximum size (in inches) you can print at DPC Prints. |
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08/10/2003 10:38:53 PM · #4 |
I use the same program,make image down to 640 X ??? then when you click on SAVE AS click on OPTIONS button where you can select the photo quality or JPEG compression,Higher the quality more KB,for DPC you are allowed only 150 KB or less!
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08/10/2003 10:46:02 PM · #5 |
Originally posted by pitsaman:
I use the same program,make image down to 640 X ??? then when you click on SAVE AS click on OPTIONS button where you can select the photo quality or JPEG compression,Higher the quality more KB,for DPC you are allowed only 150 KB or less! |
I think this in reference to printable images, which are limited to something like 14mb.
I think even non-entry portfolio images can be larger than 150k, but those bytes count against your 10mb portfolio quota.
ENTRIES must be 150k or less, and DO NOT count against your 10mb quota. |
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08/10/2003 11:00:36 PM · #6 |
Okay, so based on that, I looked at various images on my computer. Images from my camera (which is not great), my dad's camera (which is much nicer), other people's camera's (at various degrees of niceness), scanned images, random computer graphics etc.
Everything is 72 pixels per inch, even the photo I looked at that was taken by a friend on film and put on a CD by the photolab people. Those are meant to be at reprint quality.
Am I doing something wrong?
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08/10/2003 11:12:06 PM · #7 |
No, but at 72 ppi an image of 1600 pixels (like mine) would take up about 22.22 inches. If you change the RESOLUTION but NOT THE NUMBER of pixels, the image's displayed size will change proportionally. At 150 ppi (roughly twice 72), those 1600 pixels will stretch out something over 10 inches. If you pack those same 1600 pixels closer together, so there are now 300 per inch, the image will only be about 5.5 inches.
It is all simple arithmetic proportions. On one of the help screens, Drew has posted a TABLE with the exact number of pixels (both minimum and optimum) you need for every print size. Track that down and use it as your guide. Concentrate on the actual number of pixels and don't get hung up on the per-inch part and your prints will be fine.
If my image is cropped smaller than a standard print size, I fill out the canvas to the next-larger print size with a border so the image is never resampled.
Message edited by author 2003-08-10 23:15:39. |
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08/10/2003 11:32:43 PM · #8 |
Okay, I'm sorry to be such a pain, but I'm still not getting it. Say I have a 640 by 480 image. In fact, take this image, which is directly from my camera, and completely untouched by a photoeditor.
What steps would I have to take the prepare that image for printing?
(please note I am aware that the photo is crummy, and be assured it is not one of the ones I actually want to print)
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08/11/2003 12:07:46 AM · #9 |
Your 640x480 pixels will only cover an area of 4.26 x 3.2 inches at acceptable resolution (640/150=4.26, 480/150=3.2), so I'd crop it down a little and print two copies on a 4x6 print, or pad it out with a moderate border and print two copies on a 5x7.
If you want to print any larger from that file, you will have to RESAMPLE the image to create more actual pixels. I think there's a couple of tutorials and numerous thread postings on how to do this.
Don't expect to be able to enlarge an image to more than twice its original size. If your camera captures only that 640x480 frame, you are pretty much limited to printing an image no larger than about 6x9 inches, and even then you will have to be both lucky and good to get a quality result.
Also check out the tutorial on Tricks for Low-end Cameras if you haven't already. |
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