few questions about resolution

WL
Posted By
white lightning
Jan 26, 2007
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I have an image 600 x 600 pixels at 100 pixels/inch (ppi) resolution. The print size of this image is 6 x 6 inches. I have few questions about resolution. I am a bit confused.

1.) When I increase the resolution from 100 ppi to 300 ppi, the pixel dimensions change to 1800 x 1800 pixels but the print dimension remains same at 6 x 6 inches. Similarly if I decrease the resolution from 100 ppi to 72 ppi, again the pixel dimensions gets decreased but the print dimensions remain same at 6 x 6 inches. Why is this? If I change 100 ppi to 300 ppi, does my image print with a better quality?

2.) How do I increase the print dimension of my image from 6 x 6 inches? I want to print it say 12 x 12 or even more? Is it possible to do it without compromising the quality of the image? When I change the print dimension from 6 x 6 inches to 12 x 12 inches, the pixel dimension also increases. So I was wondering it’s extrapolating the additional pixel which might reduce the quality in the final print. What are your thoughts?

Thanks!!
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RG
Roy G
Jan 26, 2007
"white lightning" wrote in message
int.
What are your thoughts?
Thanks!!
Hi.

It does seem very confusing at first. The Ppi figure is of little relevance to anything except when you are about to print. It is just a measure of the density of the pixels. They can be spread out or packed in at almost any number per inch.

Your image size is the number of pixels in each dimension.

Your 600 x 600 image could be 600 inches wide if the ppi was 1 per inch (1 Ppi) or 1 inch wide if the Ppi was 600.

Neither of the above is actually changing the size of the image it is still a 600 x 600 pixel image.

As soon as you add extra pixels or remove pixels you are extrapolating (resampling), and that will have an effect on it quality.

Have a look at www.scantips.com for very good info about this.

Roy G

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