Strange TIFF files from Photoshop

S
Posted By
Snaz
Jan 28, 2004
Views
330
Replies
4
Status
Closed
Hi all,

A small problem:

Although Photoshop can open its TIFFs with no problem,
I have an old app that can’t open them. I ran a TIFF
analyzer on one TIFF in particular which shows
two problems with the Photoshop generated TIFF:

1. there are two tags that I have since found aren’t even in the TIFF manual produced by Adobe and M$…
in particular: tag 8649 and 8773.

2. in this Photoshop-generated TIFF there appear to be
bogus StripOffset values, so probably my old app cannot
even find the pixel data.

Does anybody know what the two tags are for?

Thanks.
Snaz
Related Tags
file strange tiff

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Chris Cox
Feb 2, 2004
In article
wrote:

Hi all,

A small problem:

Although Photoshop can open its TIFFs with no problem,
I have an old app that can’t open them. I ran a TIFF
analyzer on one TIFF in particular which shows
two problems with the Photoshop generated TIFF:

1. there are two tags that I have since found aren’t even in the TIFF manual produced by Adobe and M$…
in particular: tag 8649 and 8773.

Unknown tags are supposed to be ignored – so that isn’t the problem. TIFF is owned by Adobe – so I don’t know why you’re looking at M$ manuals…
And LOTS of tags aren’t documented in the TIFF spec.

2. in this Photoshop-generated TIFF there appear to be
bogus StripOffset values, so probably my old app cannot
even find the pixel data.

No, Photoshop produces clean strip offsets.

More likely your app has a bug, or the TIFF file used a compression method that your app doesn’t understand (like ZIP).

Chris
W
westin*nospam
Feb 2, 2004
Chris Cox writes:

In article
wrote:

Hi all,

A small problem:

Although Photoshop can open its TIFFs with no problem,
I have an old app that can’t open them. I ran a TIFF
analyzer on one TIFF in particular which shows
two problems with the Photoshop generated TIFF:

1. there are two tags that I have since found aren’t even in the TIFF manual produced by Adobe and M$…
in particular: tag 8649 and 8773.

Unknown tags are supposed to be ignored – so that isn’t the problem. TIFF is owned by Adobe

No, it’s not. TIFF was defined by a cooperative group, and Aldus took the responsibility of maintaining the standard. After Adobe took over Aldus, they have neglected to keep the standard up to date, so all we have is the 6.0 standard and various extensions.

– so I don’t know why you’re looking at M$
manuals…
And LOTS of tags aren’t documented in the TIFF spec.

<snip>

—
-Stephen H. Westin
Any information or opinions in this message are mine: they do not represent the position of Cornell University or any of its sponsors.
NF
Nathaniel Flick
Feb 7, 2004
in article wrote
on 1/27/04 8:03 PM:

Hi all,

A small problem:

Although Photoshop can open its TIFFs with no problem,
I have an old app that can’t open them. I ran a TIFF
analyzer on one TIFF in particular which shows
two problems with the Photoshop generated TIFF:

1. there are two tags that I have since found aren’t even in the TIFF manual produced by Adobe and M$…
in particular: tag 8649 and 8773.

2. in this Photoshop-generated TIFF there appear to be
bogus StripOffset values, so probably my old app cannot
even find the pixel data.

Does anybody know what the two tags are for?

Thanks.
Snaz

If you are running a PC that might be your answer right there. Save your Photoshop Tiffs as PC format and see if that makes a difference.

Kind Regards,
Nathaniel
—
flikWORLD Design
reply to: nat at flikworld(dot)com
CC
Chris Cox
Feb 9, 2004
In article , Stephen H. Westin
<westin*> wrote:

Chris Cox writes:

In article
wrote:

Hi all,

A small problem:

Although Photoshop can open its TIFFs with no problem,
I have an old app that can’t open them. I ran a TIFF
analyzer on one TIFF in particular which shows
two problems with the Photoshop generated TIFF:

1. there are two tags that I have since found aren’t even in the TIFF manual produced by Adobe and M$…
in particular: tag 8649 and 8773.

Unknown tags are supposed to be ignored – so that isn’t the problem. TIFF is owned by Adobe

No, it’s not. TIFF was defined by a cooperative group, and Aldus took the responsibility of maintaining the standard. After Adobe took over Aldus, they have neglected to keep the standard up to date, so all we have is the 6.0 standard and various extensions.

You have your history mixed up a little bit.
Adobe has been maintaining the standard – but through tech notes instead of a full update (due to some politics that you REALLY don’t want to know about).

But Adobe still does own and maintain the TIFF standard.

Chris

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