reducing size of an image in gimp

[Tony Arnold]

Patrick,

On 25/01/13 10:46, Patrick Asselman wrote:
> On 2013-01-24 23:41, Tony Arnold wrote:
>> On 24/01/13 22:18, Ric Moore wrote:
>>> On 01/24/2013 05:13 AM, Abhishek Dixit wrote:
>>>> As per an exam requirement mentioned here
>>>> http://ibpsreg.sifyitest.com/cwespljan13/photoupload_static.php
>>>> I have to submit two photos who size should
>>>> 1) Size of the file should be between 20kb-50kb.
>>>> 2) Size of the file should be between 10kb - 20kb.
>>>>
>>>> I have my scanned photos which have been cropped but the image is of
>>>> 139 kb size which I have to
>>>> reduce in between 20kb - 50 kb image size less than 20kb is not
>>>> acceptable (I have tried the system generated an error)
>>>>
>>>> the programm I am using is gimp is there any other program for the
>>>> same?
>>>> If this is possible in gimp then how to do so?
>>>
>>> You might try using 'export' on the original file and play with the
>>> compression level and format to get the file size you want.
>>
>>
>> I've just tried this. A jpeg file of 200x230 pixels at 72dpi and 85%
>> quality comes out at about 27kb which is within your bounds.
>>
> 
> The size of a Jpeg file also depends heavily on what is in the picture.
> If you have a picture with just one plain color it will compress very
> well, whereas a picture with many fine details will not compress as well.

It does. I tried this on a portrait picture of myself which is similar,
from what I can gather, to what the OP was asking about, so my size
estimate is probably within the bounds he needs.

> I still fail to see what this has to do with Ubuntu though.

Yes. Maybe it should be on a GIMP mailing list!

Regards,
Tony.

-- 
Tony Arnold,                        Tel: +44 (0) 161 275 6093
Head of IT Security,                Fax: +44 (0) 705 344 3082
University of Manchester,           Mob: +44 (0) 773 330 0039
Manchester M13 9PL.                 Email: tony.arnold at manchester.ac.uk