[xpost] Can someone examine these GIFs and tell me the dif..

<hoffmann.TakeThisOut@fho-emden.de> wrote in message
news:1187197606.296987.64320@22g2000hsm.googlegroups.com...
>
> -Lost schrieb:
>> Note: I'm posting to both a GIMP group because that is what I currently
>> use, and a Photoshop group because they were created in Photoshop.
>> These 2 GIFs appear to be exactly the same aside from one being white and
>> one being yellow.
>> http://foomanchu.com/trans1.gif
>> http://foomanchu.com/trans2.gif
>> However, when I export or resave trans1.gif, it gives me this message:
>> http://foomanchu.com/transparency_msg1.png
>> So, could someone please tell me the key differences?
>> -Lost
>
> I can't see structural differences. Both images don't contain
> transparent parts. Both contain 3 different indexed colors.
> In addition I had made a third GIF with transparency.
> The three GIFs were put in InDesign onto a colored rectangle.
> This reveals transparency (here only for the third image).
> Another test: Photoshop doesn't show color numbers by
> Info Palette in transparent areas (but transparency should
> have an index in a GIF, shouldn't it ?)
>
> Best regards --Gernot Hoffmann

message
It's just telling you some browsers cannot see the alpha areas of a png
most newer ones can even IE7
but older versions can see png but the clear area will appear a color
 >> Stay informed about: [xpost] Can someone examine these GIFs and tell me the dif.. 

On 15.08.2007 13:03, -Lost typed the following::
> Note: I'm posting to both a GIMP group because that is what I currently
> use, and a Photoshop group because they were created in Photoshop.
>
> These 2 GIFs appear to be exactly the same aside from one being white and
> one being yellow.
>
> http://foomanchu.com/trans1.gif
> http://foomanchu.com/trans2.gif
>
> However, when I export or resave trans1.gif, it gives me this message:
>
> http://foomanchu.com/transparency_msg1.png
>
> So, could someone please tell me the key differences?
>

Guess the key difference is at offset 00039 where one has '18' while the
other has '48' (below). Is there color indices involved?

PerL


D:\cat -h trans1.gif
00000: 47 49 46 38 39 61 32 00-32 00 A2 00 00 00 00 00 GIF89a2.2.ó.....
00010: FF FF FF 2E 4D 72 54 6A-5D FF F0 00 FF FF FF 00 .MrTj] ≡. .
00020: 00 00 00 00 00 21 F9 04-01 00 00 05 00 2C 00 00 .....!∙......,..
00030: 00 00 32 00 32 00 00 03-A7 18 BA DC FE 30 CA 49 ..2.2...º.â•‘â–„â– 0â•©I
00040: AB BD 38 EB 8D 87 FF 60-28 8E 24 18 79 42 AA AE ½â•œ8δìç `(Ä$.yB¬«
00050: 6C EB BE E9 00 A1 70 6D-BF F2 33 DC 7C 2F E4 8E lδâ•›Θ.ípmâ”�≥3â–„|/ΣÄ
00060: 9D 6F 88 9B 11 8F 2C 60-43 88 44 2A 19 CC 26 F1 ¥oê¢.Å,`CêD*.â• &±
00070: B9 88 4A 7D 54 85 F5 CA-CB 06 B6 5C 9B 17 1C 86 â•£êJ}Tà⌡╩╦.â•¢\¢..å
00080: 8D CB 58 23 BA AB 5E 8B-DB B7 C8 F0 DC 93 A7 75 ì╦X#â•‘½^ï█╖╚≡â–„ôºu
00090: 3E 7B 8F CE D3 B3 F1 75-10 73 70 36 7E 37 7C 71 >{Å╬╙│±u.sp6~7|q
000A0: 82 77 41 79 8A 7B 84 35-86 6F 80 6E 35 88 95 2E éwAyè{ä5åoÇn5êò.
000B0: 97 98 49 90 9B 2A 9A 9E-31 9D A1 A0 A4 A3 9E A5 ùÿIÉ¢*Ü₧1¥íáñú₧Ñ
000C0: A8 A7 9B A9 AC AB 98 AD-B0 AF 95 B1 B4 B3 6E B5 ¿º¢âŒ�¼½ÿ¡â–‘»ò▒┤│nâ•¡
000D0: B8 33 25 BC BD BD 1C C0-C1 C2 C3 C4 C5 C6 18 09 ╕3%�╜╜.└┴┬├─┼╞..
000E0: 00 3B .;%�╜╜.└┴┬├─┼╞..

D:>cat -h trans2.gif
00000: 47 49 46 38 39 61 32 00-32 00 A2 00 00 00 00 00 GIF89a2.2.ó.....
00010: FF FF FF 2E 4D 72 54 6A-5D FF F0 00 FF FF FF 00 .MrTj] ≡. .
00020: 00 00 00 00 00 21 F9 04-01 00 00 05 00 2C 00 00 .....!∙......,..
00030: 00 00 32 00 32 00 00 03-A7 48 BA DC FE 30 CA 49 ..2.2...ºHâ•‘â–„â– 0â•©I
00040: AB BD 38 EB 8D 87 FF 60-28 8E 24 18 79 42 AA AE ½â•œ8δìç `(Ä$.yB¬«
00050: 6C EB BE E9 00 A1 70 6D-BF F2 33 DC 7C 2F E4 8E lδâ•›Θ.ípmâ”�≥3â–„|/ΣÄ
00060: 9D 6F 88 9B 11 8F 2C 60-43 88 44 2A 19 CC 26 F1 ¥oê¢.Å,`CêD*.â• &±
00070: B9 88 4A 7D 54 85 F5 CA-CB 12 B6 5C 9B 17 1C 86 â•£êJ}Tà⌡╩╦.â•¢\¢..å
00080: 8D CB 58 23 BA AB 5E 8B-DB B7 C8 F0 DC 93 A7 75 ì╦X#â•‘½^ï█╖╚≡â–„ôºu
00090: 3E 7B 8F CE D3 B3 F1 75-10 73 70 36 7E 37 7C 71 >{Å╬╙│±u.sp6~7|q
000A0: 82 77 41 79 8A 7B 84 35-86 6F 80 6E 35 88 95 2E éwAyè{ä5åoÇn5êò.
000B0: 97 98 49 90 9B 2A 9A 9E-31 9D A1 A0 A4 A3 9E A5 ùÿIÉ¢*Ü₧1¥íáñú₧Ñ
000C0: A8 A7 9B A9 AC AB 98 AD-B0 AF 95 B1 B4 B3 6E B5 ¿º¢âŒ�¼½ÿ¡â–‘»ò▒┤│nâ•¡
000D0: B8 33 25 BC BD BD 1C C0-C1 C2 C3 C4 C5 C6 18 09 ╕3%�╜╜.└┴┬├─┼╞..
000E0: 00 3B .;%�╜╜.└┴┬├─┼╞..
 >> Stay informed about: [xpost] Can someone examine these GIFs and tell me the dif.. 

On 15 Aug., 19:06, hoffm....DeleteThis@fho-emden.de wrote:

> Both contain 3 different indexed colors.

Um... no? One does contain 4, one five colors (the yellow one).


HTH,
Michael
 >> Stay informed about: [xpost] Can someone examine these GIFs and tell me the dif.. 

On Wed, 15 Aug 2007 18:29:26 -0400, KatWoman wrote:

> It's just telling you some browsers cannot see the alpha areas of a png
> most newer ones can even IE7
> but older versions can see png but the clear area will appear a color

The dialog/message pops up when saving a GIF that was loaded as a GIF.
But only on this particular file not on every GIF.

Ciao,
Marc 'BlackJack' Rintsch
 >> Stay informed about: [xpost] Can someone examine these GIFs and tell me the dif.. 

Per Larsen's response:

> On 15.08.2007 13:03, -Lost typed the following::
>> Note: I'm posting to both a GIMP group because that is what I
>> currently use, and a Photoshop group because they were created in
>> Photoshop.
>>
>> These 2 GIFs appear to be exactly the same aside from one being white
>> and one being yellow.
>>
>> http://foomanchu.com/trans1.gif
>> http://foomanchu.com/trans2.gif
>>
>> However, when I export or resave trans1.gif, it gives me this
>> message:
>>
>> http://foomanchu.com/transparency_msg1.png
>>
>> So, could someone please tell me the key differences?
>>
>
> Guess the key difference is at offset 00039 where one has '18' while
> the other has '48' (below). Is there color indices involved?

<snip hex dump>

I did notice the binary differences, but couldn't make much sense of
that.

As far as color indices go, I'm not *totally* sure. In what ways would a
color index negatively affect the images?

Here's the scenario: these images are being used in an transparent
application. The first image however does now allow the transparency
where the second one does.

--
-Lost
Remove the extra words to reply by e-mail. Don't e-mail me. I am
kidding. No I am not.
 >> Stay informed about: [xpost] Can someone examine these GIFs and tell me the dif.. 

On 18.08.2007 03:58, -Lost typed the following::
> Per Larsen's response:
>
<snip>

>> Guess the key difference is at offset 00039 where one has '18' while
>> the other has '48' (below). Is there color indices involved?
>
> <snip hex dump>
>
> I did notice the binary differences, but couldn't make much sense of
> that.
>
> As far as color indices go, I'm not *totally* sure. In what ways would a
> color index negatively affect the images?

My thoughts was that if the image uses a color table (index), and the
different value was actually inside the index, a different value could
probably change (one of the) color(s) in the image (which seems to be
the the typical difference between the two image files — not?).

--
PerL



> Here's the scenario: these images are being used in an transparent
> application. The first image however does now allow the transparency
> where the second one does.
>
 >> Stay informed about: [xpost] Can someone examine these GIFs and tell me the dif..