Definitely an encode/decode problem

There must be something unique to this image that some programs
decode just fine but others have a problem. Unfortunately I don't
know enough about the jpg specification to know what the problem
is.

It could be that some programs jpg decompression routines are
faulty, and show the lines. Not all decoders are equal.

Yet, in my tests with really old software - my thumbnail viewer
dates back to 1999 or earlier - leads me to think the problem
is actually with Photoshop's encoding of the image.

The reason some viewers experience the lines while others don't
is because, again not all decoders are equal. Some may be failing
gracefully while others are adhering too strictly to the
specification and failing badly. Or it could be the other way
around - those that adhere strictly are OK, and it's the ones
that don't follow the rules correctly which fail.

The reason several programs may share the same problem viewing
the image is because they all import the same code library.

To test all this, somehow we'd have to do controlled tests of
encoding that TIFF to jpg with various programs, and viewing
all the results with more various programs.

How big is the TIFF file? I also have a recent version of PSP
on the other computer which can handle 16 bit TIFF's. I'm
wondering if that program's encoding to jpg would have any
issues.

Brian
--
http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism
Sed quis custodiet ipsos Custodes?