[xpost] Can someone examine these GIFs and tell me the differences?

-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

wrote in message

-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

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.║▄■0╩I 00040: AB BD 38 EB 8D 87 FF 60-28 8E 24 18 79 42 AA AE ½╜8δìç `(Ä$.yB¬« 00050: 6C EB BE E9 00 A1 70 6D-BF F2 33 DC 7C 2F E4 8E lδ╛Θ.ípm┐≥3▄|/ΣÄ 00060: 9D 6F 88 9B 11 8F 2C 60-43 88 44 2A 19 CC 26 F1 ¥oê¢.Å,`CêD*.╠&± 00070: B9 88 4A 7D 54 85 F5 CA-CB 06 B6 5C 9B 17 1C 86 ╣êJ}Tà⌡╩╦.╢\¢..å 00080: 8D CB 58 23 BA AB 5E 8B-DB B7 C8 F0 DC 93 A7 75 ì╦X#║½^ï█╖╚≡▄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¢⌐¼½ÿ¡░»ò▒┤│n╡ 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…ºH║▄■0╩I 00040: AB BD 38 EB 8D 87 FF 60-28 8E 24 18 79 42 AA AE ½╜8δìç `(Ä$.yB¬« 00050: 6C EB BE E9 00 A1 70 6D-BF F2 33 DC 7C 2F E4 8E lδ╛Θ.ípm┐≥3▄|/ΣÄ 00060: 9D 6F 88 9B 11 8F 2C 60-43 88 44 2A 19 CC 26 F1 ¥oê¢.Å,`CêD*.╠&± 00070: B9 88 4A 7D 54 85 F5 CA-CB 12 B6 5C 9B 17 1C 86 ╣êJ}Tà⌡╩╦.╢\¢..å 00080: 8D CB 58 23 BA AB 5E 8B-DB B7 C8 F0 DC 93 A7 75 ì╦X#║½^ï█╖╚≡▄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¢⌐¼½ÿ¡░»ò▒┤│n╡ 000D0: B8 33 25 BC BD BD 1C C0-C1 C2 C3 C4 C5 C6 18 09 ╕3%╝╜╜.└┴┬├─┼╞.. 000E0: 00 3B .;%╝╜╜.└┴┬├─┼╞..

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

On 15 Aug., 19:06, wrote:

Both contain 3 different indexed colors.

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

HTH,
Michael

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.

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.