Help with PS action - change ppi?

Scam · 5 Aug 2011 at 19:12

Quick question. I have an action that I use on my processed images that resizes them using 'fit image' and does a little sharpening. I use it to resize them to a 1024 box for uploading to Flickr/FB etc.

I've just realised that my action keeps the dpi/ppi

confused: ) as 300 which is rather unnecessary. I want to change this to 72 but I'm having trouble doing it. If I record a new step using the 'image size' thing I seem to get blurry images. I don't think it recognises that I want the size of the image to stay the same (even if I put in 100 percent) and just change the ppi.

Can anyone help? Or maybe I should keep my images at 300ppi? What does everyone use for Flickr?

Steeps · 5 Aug 2011 at 20:14

I thought PPI didn't matter unless you were directly printing the picture? 900px is going to be 900px on the screen no matter what PPI is used.

Scam · 7 Aug 2011 at 13:25

Hmn I think I got myself a bit confused. Doing the resizing within an action didn't seem to work. If I change the PPI manually and ensure the image size stays at 100% it obviously doesn't change anything as you say. My question then is, why do images off the web come in at 72ppi? I guess it doesn't matter but.. :confused:

whitecrook · 7 Aug 2011 at 13:32

When veiwing images on your screen the true ppi of a downloaded image is given by the resolution/size of your screen. You can calculate this by measuring the size of the image with a ruler and dividing the size in pixels by this number.

All if this is of course totally pointless.

asim18 · 7 Aug 2011 at 23:23

PPI information is only used to ensure images are printed at the correct size.

EG. A 600*400 pixel photo printed at 600PPI will be one inch wide.

You could set it to 1000 PPI, and it wont make a difference on screen.

whitecrook · 8 Aug 2011 at 01:11

asim18 said:
PPI information is only used to ensure images are printed at the correct size.

EG. A 600*400 pixel photo printed at 600PPI will be one inch wide.

You could set it to 1000 PPI, and it wont make a difference on screen.

Well, not at least until we get true resolution independent screens and displays with OS that support it. Then things really will be WYSIWYG, and a bigger screen will give you more definition, rather than more 'space'
at least 10 years away.