9494 - Revaluate quality settings for JPEG

Status: RESOLVED FIXED

(Core :: Graphics: ImageLib, enhancement, P3)

Description

[Péter Bajusz]

DESCRIPTION
  There are some minor visual problems displaying this image.
  Eg. you can see a dark horizontal line above the word "Multimedia".
  It looks like there are some rounding error involved with the jpeg decoding.

REGRESSION
  I've tested this on Win98 with both 16bit and 24bit color depth.

  Occurs on:
    Mozilla 1999-07-04-08
    Netscape Communicator 4.6
    ACDSee 32 v2.4

  Doesn't occur on:
    Internet Exploder 4.0
    Gimp 1.1 win32 port
    Adobe Photoshop 5.0

I'll attach the image just in case it gets lost.

Comment 1

[Péter Bajusz]

Attachment: Same image whats in the url

Comment 2

[pnunn]

thanks for the demo url.
If you notice others send them on.
-pn

Comment 3

[pnunn]

The "dark horizontal line" is a jpeg decompression artifact.
After beta, I take a look at changing the quality setting
for the decoder.
-pn

Comment 4

[Eli Goldberg]

Gut feeling is that this should be kept in 5.0/M20-ish timeframe, but e-mailed
pnunn to get her $.02.

Comment 5

[pnunn]

eli:
this is not a big issue. There is always a
speed/quality trade off.  For an image with
large flat areas and few colors, a gif would have given better
compression and a better result.

Once we get the browser speed up, then we can balance the
cost of changing the setting for decompression.

-pn

Comment 6

[Eli Goldberg]

Verified later. Thanks, Pam.

Comment 7

[Christopher Hoess (gone)]

LATER is deprecated.

Comment 8

[Christopher Hoess (gone)]

reassign

Comment 9

[Stuart Parmenter]

we fixed this