Achieving 300ppi

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24 Aug 2011 - 1:52 PM

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digicammad (e2 Member)

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24 Aug 2011 - 2:21 PM

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Hi Caroline

PPI is totally irrelevant until you want to output the image onto a printer. Cameras do not care about ppi and just concentrate on actual pixel sizes.

PPI is only a setting which tells a printer how tightly to pack the pixels from the image into the output. The higher the number the more tightly packed your image will be and therefore the higher the quality will be.

In fact, it wouldn't matter if you never changed the ppi setting as long as you tell the printer what the output size was (eg 297mm x 210mm).

Hope that helps.

Ian

User_Removed

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24 Aug 2011 - 2:47 PM

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Ian is bang on, it doesn't alter the quality or the resolution of your picture. If you're not careful and you change it and the picture gets resampled (pixels invented or discarded) you will damage the picture quality.

Have a read of this and this

GlennH (e2 Member)

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24 Aug 2011 - 3:40 PM

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Caroline, just switch the resolution to 300ppi in Photoshop, making sure that resampling is switched off. The file size and pixel dimensions shouldn't change, although the 'document size' will.