38656 - Non repeating bg image gets funny black line underneath in <TH>

Status: VERIFIED DUPLICATE of bug 37589

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

Description

[Paul McGarry]

A non-repeating, small background image seems to result in a small black line
underneath. This is visible in the center column, in the title for each article.

I'm currently looking at it with Linux nightly build 2000050820 but I have also
seen it in Windows builds.

The valid part of the style sheet is probably:

DIV.article TABLE TH
{
 background-image : url("slc00000.gif");
 background-position: top left;
 background-repeat : no-repeat;
 padding-left : 10px;
 text-align: left;
 background-color: #006666;
 color: #FFFFFF;
 font-weight: bolder;
}
but the whole thing can be got at here:
http://homepages.tig.com.au/~mcgarry/opera/styledemo/screen.css

(As a side note the page itself is a conversion of a Slashdot page to valid
HTML4 and CSS in order to demonstrate media-specific (screen, print and
projection) style sheets under Opera 4 beta 3, apart from this bug Mozilla also
renders it very well for screen)

Comment 1

[Jesse Ruderman]

This image is causing trouble in bug 37589 as well, but it would be interesting 
to find out why the image shows up as black on this page.

Comment 2

[Paul McGarry]

Using 'identify' (part of the imagemagik toolkit) on the image generates the
following output:
------
[paulm@beefcake slashdot]$ identify -verbose slc00000.gif 
Image: slc00000.gif
  format: GIF (CompuServe graphics interchange format)
  type: true color with transparency
  class: DirectClass
  matte: ( 50,102,100) #326664
  colors: 8
       123: ( 50,102,100)  #326664  #326664
         2: ( 70, 82, 84)  #465254  #465254
         6: ( 90,114,111)  #5a726f  #5a726f
         2: (122,134,132)  #7a8684  #7a8684
         1: (138,166,164)  #8aa6a4  #8aa6a4
         1: (170,170,188)  #aaaabc  #aaaabc
         4: (206,206,204)  #cececc  #cececc
        30: (254,254,252)  #fefefc  #fefefc
  geometry: 13x13
  depth: 8
  filesize: 139b
  interlace: Plane
  background-color: #465254
  border-color: gray74
  matte-color: gray74
  page geometry: 13x16+0+0
  delay: 10
  compression: LZW
  runlength packets: 36 of 169
  tainted: False
  signature: 98b984cc9f166d150e939321bcc56d3a
  comments:
  Made with GIMP
----

It looks like it may have something to do with the fact the lines:
geometry: 13x13
and
page geometry: 13x16+0+0
have different height values? I don't know enough about gifs to understand what
this means, but The Gimp renders it as a 13x16 image with a sort of 'active'
13x13 window starting from the top left.
Seeing as we are seeing wierdness in the lower few pixels this seems pertinant.

Comment 3

[Pierre Saslawsky]

This bug was originally filed against the Style System but the more recent 
comments point to the GIFs. Reassigned to Imagelib.

Comment 4

[pnunn]

I think this is a dupe. I'll check into it.
-P

Comment 5

[Gagan]

Pam do you have the dup number? this seems to me as a minus otherwise. 

Comment 6

[pnunn]

*** This bug has been marked as a duplicate of 37589 ***

Comment 7

[Paul Wyskoczka]

Verified.