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jpeg compression levels

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jpeg compression levels Andrew 23 Aug 13:31
  jpeg compression levels Raphaël Quinet 23 Aug 14:42
jpeg compression levels Jeffery Small 23 Aug 21:13
  jpeg compression levels Andrew 23 Aug 21:28
jpeg compression levels Christine Sommerfeldt 24 Aug 14:22
Andrew
2007-08-23 13:31:27 UTC (over 17 years ago)

jpeg compression levels

Hello,

I need to make a JPEG "saved at a high quality setting (i.e. Photoshop level 10 or above)". Since I don't know what Photoshop is ;), could someone please tell me what the equivalent would be using GIMP?

TIA,

Andrew

Raphaël Quinet
2007-08-23 14:42:00 UTC (over 17 years ago)

jpeg compression levels

On Thu, 23 Aug 2007 13:31:27 +0200, Andrew wrote:

I need to make a JPEG "saved at a high quality setting (i.e. Photoshop level 10 or above)". Since I don't know what Photoshop is ;), could someone please tell me what the equivalent would be using GIMP?

Here is a table that provides an approximate mapping between Photoshop quality levels and GIMP (actually IJG JPEG library) quality levels:

Adobe Photoshop quality 12

- Setting the GIMP quality level to 95 or higher is a waste of disk space and/or bandwidth.

- Setting the GIMP quality level to anything below 50 is a bad idea.

- I just saw that the GIMP user manual has a very confusing description for the subsampling parameter and it is not even correct. I will try to fix that soon.

This is probably way more information that you were expecting. The short answer is: set your GIMP quality level to 93 or higher (but in fact, 90 should be OK). And set the subsampling to 1x1,1x1,1x1.

-Raphael

Jeffery Small
2007-08-23 21:13:33 UTC (over 17 years ago)

jpeg compression levels

"=?UTF-8?B?UmFwaGHDq2w=?= Quinet" writes:

This is probably way more information that you were expecting. The short answer is: set your GIMP quality level to 93 or higher (but in fact, 90 should be OK). And set the subsampling to 1x1,1x1,1x1.

Raphael:

Where do you set this? Is there some global variable or Xdefault? I do not see anything on the Preference dialog. Thanks

Regards, --
Jeff

Andrew
2007-08-23 21:28:49 UTC (over 17 years ago)

jpeg compression levels

Jeffery Small wrote:

"=?UTF-8?B?UmFwaGHDq2w=?= Quinet" writes:

This is probably way more information that you were expecting. The short answer is: set your GIMP quality level to 93 or higher (but in fact, 90 should be OK). And set the subsampling to 1x1,1x1,1x1.

Raphael:

Where do you set this? Is there some global variable or Xdefault? I do not see anything on the Preference dialog. Thanks

Regards, --
Jeff

Pardon me for butting in. You set this in the 'save as jpeg' dialogue when you select to save in jpeg format.

Thanks very much Raphael.

Andrew

Christine Sommerfeldt
2007-08-24 14:22:50 UTC (over 17 years ago)

jpeg compression levels

Hi Raphael,

this was very useful and interesting to me, thanks. Although it wasn't me who asked for the jpeg compression levels, I can really profit from this detailed information.

Keep at it! :-)

Yours,

Christine