Image resolution

JO
Posted By
Jean Olbrechts
Feb 15, 2007
Views
249
Replies
2
Status
Closed
Hello,
I scanned some slides from 20 years back with a Polaroid SprintScan 35 Plus scanner.

Using the highest resolution (2700 ppp), I use Photoshop CS2 to adjust the pictures at 1920×1200 pixel definition. I first reduce the resolution the closest to this dimension. Than, using the Crop option to adjust.
But…the resolution is still much to high ! Picture is about 2MB.

Using Photoshop to reduce the resolution 5O%, maintaining the same pixels definition 1920x1200px, the picture is still at 2MB !

Is there any logical explanation ?

Thanks for comment, (and solution) 🙂
Jean
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C
chrisjbirchall
Feb 15, 2007
First off. 2MB is by no means a large file size.

Secondly changing the resolution of an image without altering the pixel dimansions does absolutely nothing to the file itself other than change the metadata entry for the resolution tag.

Resolution (ppi) is only of relavence when printing so you can instruct the printer drivers what size the image is to be printed at the chosen (usualy 300ppi) resolution.
RK
Rob_Keijzer
Feb 15, 2007
What Chris said.
plus: If you indeed want a smaller image (web output, for instance) go to Image Resize. Then enter the vertical or horizontal dimension and have Resample ticked.

Make all your image adjustments (less sharpening) before reducing anything (size, colour depth etc.)

Rob

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