With jpeg, you can change the amount of compression, and you are likely to be fine with the image quality.

You can also change the resolution - the pixels per inch. 72 is typical for the internet; 200 for printing, higher quality for historical quality images. Some display/ formats will also change their physical size.


I'm not sure if gif offers compression or not.

Dora


-----Original Message----- From: Pat David
Sent: Thursday, July 09, 2015 5:40 PM
To: rhimbo ; gimp-user-list@gnome.org
Cc: notificati...@gimpusers.com
Subject: Re: [Gimp-user] How to reduce image file size while retaining width/height of image?

You can export the file to a lossy file format such as JPG (
https://en.wikipedia.org/wiki/JPEG).  GIMP has an option to "Show preview
in image window", which will also give you an estimate of the file size
from the parameters.  You can modify the "Quality" slider until you reach a
desired file size.  Does this help with what you wanted to achieve?

On Thu, Jul 9, 2015 at 2:22 PM rhimbo <for...@gimpusers.com> wrote:

Hi,

I would like to reduce the file size of an image.  But I would like to
retain
the width/height dimension.  Basically, I frequently need to do this to
post
images of screen grabs to forums when I have a question and want to show
the
important elements.

I've found the Tools -> Transform Tools -> Scale.

I've searched for scale related posts but don't see how to reduce the file
size
without affecting the width/height of my image.

Many thanks,

--
rhimbo (via www.gimpusers.com/forums)
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