Corrupt Jpegs

I have a problem where I am unable to pin down the cause. Sometimes when I create a Jpeg from an existing Jpeg or Gif using Photoshop 6 and then FTP it to my site it displays incorrectly. Usually the Jpeg starts to display correctly and then I get bands of different colour mixes. Occasionally the Jpegs don’t display at all. However they always display correctly on my in-PC test server. Bothe servers are Apache.

A typical scenario is I resize a batch of (say) about 10 Jpegs in PS6, FTP them to my site (using Terrapin 2.3.2), and 9 work but 1 displays incorrectly. I can usually cure this by going back to the original source (slide or psd file) and recreate the one that is corrupt.
I have checked the size of the Jpegs, and the copies on my own hard disk and the server disk match exactly, but the one displayed in my browser is sometimes a few bytes short.

I am not sure this is a PS problem, but remaking the Jpeg always cures it. Has anyone any ideas?
.

Sometimes when I
create a Jpeg from an existing Jpeg or Gif using Photoshop 6 and then FTP it to my site it displays incorrectly.

Harry Marshall wrote:

I have a problem where I am unable to pin down the cause. Sometimes when

create a Jpeg from an existing Jpeg or Gif using Photoshop 6 and then

to my site it displays incorrectly. Usually the Jpeg starts to display correctly and then I get bands of different colour mixes. Occasionally

Jpegs don’t display at all. However they always display correctly on my in-PC test server. Bothe servers are Apache.

A typical scenario is I resize a batch of (say) about 10 Jpegs in PS6,

them to my site (using Terrapin 2.3.2), and 9 work but 1 displays incorrectly. I can usually cure this by going back to the original

(slide or psd file) and recreate the one that is corrupt.
I have checked the size of the Jpegs, and the copies on my own hard disk

the server disk match exactly, but the one displayed in my browser is sometimes a few bytes short.

I am not sure this is a PS problem, but remaking the Jpeg always cures

Has anyone any ideas?
.

Sounds like the hosting server is either not getting all the bytes, corrupting them or failing to load the whole image. What hosting site? What bandwidth do you have? Does a forced reload of the page get the full image? Is it always the last photo uploaded?

g-w

Sometimes when I
create a Jpeg from an existing Jpeg or Gif using Photoshop 6 and then FTP it to my site it displays incorrectly.

9 times out of 10, this indicates the FTP program you are using is

"ASCII mode" instead of "binary mode."
—
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However had just noticed I still have a faulty image on my site. It is

slightly corrupt with a small discolored band at the bottom, so I probably overlooked it when I uploaded it. The url is below for anyone that wants

take a look. The other faulty images were similar, but usually more of the image is corrupt.

http://www.harrys-stuff.com/arab-gulf-sharjah/sharjah-fort-g ates.php

"Harry Marshall" wrote in message
<snip>

However had just noticed I still have a faulty image on my site. It is

only

slightly corrupt with a small discolored band at the bottom, so I probably overlooked it when I uploaded it. The url is below for anyone that wants

to

take a look. The other faulty images were similar, but usually more of the image is corrupt.

http://www.harrys-stuff.com/arab-gulf-sharjah/sharjah-fort-g ates.php

I did some more checking. The original jpeg on my hard disk is 30,541 bytes. The one on the server is 30,538 bytes – 3 bytes lost.

This would look like an FTP problem, yet I can only cure it by making a fresh Jpeg in Photoshop. Is it possible that Photoshop could put some iffy code in a Jpeg that only shows up after it has been FTP’d?
If I download the Jpeg from the server with FTP it ends up as 30,634 bytes and does not display at all.

"Tacit" wrote in message

Sometimes when I
create a Jpeg from an existing Jpeg or Gif using Photoshop 6 and then FTP it to my site it displays incorrectly.

9 times out of 10, this indicates the FTP program you are using is

uploading in

"ASCII mode" instead of "binary mode."
—
Biohazard? Radiation hazard? SO last-century.
Nanohazard T-shirts now available! http://www.villaintees.com Art, literature, shareware, polyamory, kink, and more:
http://www.xeromag.com/franklin.html

That was my first thought. So I deliberately uploaded in binary, but it made no difference. The FTP is normally set to auto, and as it uploads other Jpegs and Gifs OK, I don’t think this is the problem.

On Sat, 12 Jun 2004 16:05:57 +0100, "Harry Marshall" wrote:

That was my first thought. So I deliberately uploaded in binary, but it

no difference. The FTP is normally set to auto, and as it uploads other Jpegs and Gifs OK, I don’t think this is the problem.

Your description of filesize shrinking on upload and growing on download tells something different.

Michael

"Xalinai" wrote in message

On Sat, 12 Jun 2004 16:05:57 +0100, "Harry Marshall" wrote:

<snip>

That was my first thought. So I deliberately uploaded in binary, but it

made

no difference. The FTP is normally set to auto, and as it uploads other Jpegs and Gifs OK, I don’t think this is the problem.

Your description of filesize shrinking on upload and growing on download tells something different.

Michael

You were right. It was a Terrapin FTP problem. I found more Jpegs on my site that had 1 byte missing, even though they displayed OK.

As a test I downloaded a trial version of Cuteftp and re-uploaded the faulty Jpeg. It now is the same size on my hard disk and the server and displays OK.

I never had problems with Terrapin before, but the problem may have started when I upgraded from version 2.3.1 to 2.3.2.

I have looked for a FTP products forum but with no success. Does anyone know of one?