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04/24/2006 03:34:41 AM · #1 |
Hi all
Having problems with PPI. My printer company demands not less than 250ppi and I know to uncheck the box in Image size, but if I want to print it at A3 size (the maximum that my camera manual tells me that I can print), then my PPI stays relatively low, i.e. around 90ppi.
For example, if I size my image at 20"x24", the ppi is 154ppi. But if I cheat and size the image at 20cmx24cm, then the ppi is 330ppi. The pixel dimensions stay the same irrespestive. I then upload the image to my printer and they print it at 20"x24" (despite that it is actually sized at 20cmx24cm)
So, to the questions:
1. By doing this (changing the size to centrimetres so that the ppi is acceptable), am I effecting the quality of the image?
2. Is there a better way, am I doing something wrong that I can't get a decent ppi just by resizing with inches
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04/24/2006 09:31:50 AM · #2 |
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04/24/2006 09:38:07 AM · #3 |
If the "pixel dimensions" remain the same, then you haven't changed anythng except the units you use to express the size. If you have 250 pixels, you can print 1 inch at 250 ppi or 2.5cm at 100 ppcm -- exactly the same.
If you want to print more than one inch from those pixels, you either have to print at a lower resolution (e.g. 2 inches at 125 ppi) or else resample the image so you create more pixels.
See if this tutorial helps.
Message edited by author 2006-04-24 09:39:47. |
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04/24/2006 09:43:53 AM · #4 |
Originally posted by GeneralE:
If the "pixel dimensions" remain the same, then you haven't changed anythng except the units you use to express the size. If you have 250 pixels, you can print 1 inch at 250 ppi or 2.5cm at 100 ppcm -- exactly the same.
If you want to print more than one inch from those pixels, you either have to print at a lower resolution (e.g. 2 inches at 125 ppi) or else resample the image so you create more pixels.
See if this tutorial helps. |
Thanks, Paul. I'll run through this tutorial and post any further queries. Might be a bit too much maths for me at 11:45pm, so I'll be trawling through that tomorrow. Thanks, again. N
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04/24/2006 09:56:14 AM · #5 |
| Too much math for 6:30 a.m. (where I am) too, that's why I gave you such lame examples : ) |
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