Resize

Pixels per inch, or parts per inch?

This is part of a tutorial by Hayley64 from the PSP version 9 newsgroup:

Note: I know you are all thinking …but wait… what about 72 resolution/pixels per inch? We all hear about it! Here is the misconception that 200 pixels/inch should be changed from 200 to 72 when saving for the web! Pixels Per Inch (PPI), however, has nothing to do with the size of the image in the computer, nor the size of the file on disk. PPI is a number that image editors pass to the printer, telling it how many pixels to lay down on each inch of paper (DPI).

Resize dialog

Resolution is the number of pixels printed per inch. More pixels per inch (ppi) will create smaller printed pixels and a smaller printed image. Fewer ppi will create larger printed pixels and a larger printed image. Resizing can also change the image’s resolution, leaving the number of pixels in an image (and the file size) unchanged.

Example:

Fig 1: 72 resolution/ppi 500x625 pixels wide and JPEG Optimized to 100,929bytes
Print Size states that it is 6.944x8.681 Inches

Figure1


Fig 2: 200 resolution/ppi 500x625 pixels wide and JPEG Optimized to 100,929bytes

Print Size states that it is 2.500x3.125 Inches

Figure2

Resize

When checking their Properties/General, they are BOTH 98.5KB (100,929bytes)
Both needed the same Compression Value of 24 to get to the SAME 100,929bytes!!

They are both just as clear!

They are both the same size on your computer monitor!

But they will print out different sizes!

Note: Both of these images were reduced by 70% for the sake of this tutorial. However the information given about the final numbers were taken before the 70% resize.

If you don’t believe me about the 200 to 72ppi issue, ask about this in the CorelPSP9 Newsgroups and see what the “Real Experts” have to say about it. I tried and they won!!

Quote Angela M. Cable “ It's not reasoning. It's simply a fact!!” Thanks to All!!

Newsgroups ~ cnews.corel.com>corel.PaintShopPro9

Message post title: Save to web in PSP9? By Haley64


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