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Posted: 12/30/2003 3:39:38 PM EDT
"tx for the interesting photo. i would like you to rescan the photo of the tail
at 300 dpi - it is presently at 150 dpi." i sent the guy this picture, what exactly does he want me to do? enlarge? darken?  |
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Posted: 12/30/2003 3:47:54 PM EDT
[#1]
Dots Per Inch.
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Posted: 12/30/2003 3:49:50 PM EDT
[#2]
dots per inch
He is asking for you to scan it over again, at a higher sampling rate. The scanner "sees" everything as a pattern of dots. How many dots determines how fine of detail it can make out. He might want higher dpi so he can enlarge the photo without it losing as much quality. You could just resample it with photoshop and sent it to him again. But that wouldn't be as good as scanning it at a higher resolution. Scanning it at 300 DPI vs 150 DPI could potentially double your filesize, but if you save it as a jpg or gif it would shrink down some. |
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Posted: 12/30/2003 3:50:17 PM EDT
[#3]
He wants you to rescan it at a higher resolution. Of course, you'd have to have the source picture to do this as it can only be done at the time of scanning. Most any scanner nowadays should be capable of scanning at well over 300 dpi, which by the way is about the lowest you'd want to go for printing.
--ZERO |
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Posted: 12/30/2003 3:50:51 PM EDT
[#4]
He wants you to increase the resolution of the photo. Most typically for printing purposes. Images for the web dont need high resolution, but images for printing do.
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Posted: 12/30/2003 3:59:09 PM EDT
[#5]
Quoted: Scanning it at 300 DPI vs 150 DPI could potentially double your filesize, but if you save it as a jpg or gif it would shrink down some. Actually, it would quadruple the file size (approx). dpi is dots wide x dots tall. So, 2 times as many dots wide x 2 times as many tall = 4 times as many dots. |
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Posted: 12/30/2003 4:03:42 PM EDT
[#6]
Your screen resolution is tiny, at only 72 dots per inch (dpi). Old, late-80's laser printers printed at 300 dpi. Today, even the cheapest laser printers print at 600 dpi, and most photo inkjets can print up to 1200 dpi (though the dots are too big, but that's another discussion). Glossy magazine printing is at least 2400 dpi, and uses super tiny dots to give very good resolution.
If you print a 150 dpi picture, it's going to look grainy and pixelated, even though it looks okay on the screen. That's because you're USED to seeing low resolution on computer screens, and much HIGHER resolutions on paper. You should have settings in your scanning software to adjust the resolution at the time you are scanning. The resulting file will be MUCH larger, but will look a lot better when printed out, or after being processed with effects. -Troy |
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Posted: 12/30/2003 4:09:49 PM EDT
[#7]
It's dots of ink per inch , the higher , the better.
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Posted: 12/30/2003 4:12:42 PM EDT
[#8]
Quoted: Quoted: Scanning it at 300 DPI vs 150 DPI could potentially double your filesize, but if you save it as a jpg or gif it would shrink down some. Actually, it would quadruple the file size (approx). dpi is dots wide x dots tall. So, 2 times as many dots wide x 2 times as many tall = 4 times as many dots. Oops my bad, tax_monster is right. |
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Posted: 12/30/2003 4:35:34 PM EDT
[#9]
Pixel size is as, if not more important than DPI. I print images that are anywhere from 20 to 50 megs in size everyday and most are only 72 to 100 DPI and they are as clear as if you were looking at them in person. Try scanning in 32bit CMYK mode if possible, you should get better results over RGB.
Try lines per inch as well if your scanner has that option. Here's some more info on that subject [url]http://desktoppub.about.com/cs/intermediate/a/measure_lpi.htm[/url] Scanning is definitely a trial-and-error process. Good Luck. |
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