On Fri, 2 Mar 2001 05:29:57 -0500 (EST), Thomas Mueller wrote:
>> I just received an image file from my son. It is identified like this
>> in the attachment headers:
>> Content-Type: image/pjpeg; name="Dsc00074.jpg"
>> Content-Transfer-Encoding: base64
>> Content-Disposition: attachment; filename="Dsc00074.jpg"
>> It shows up only as a red box in Arachne. I have successfully decoded
>> it without error with a BASE64 decoding utility, but none of my image
>> viewing software will display it. I get errors like "this image format
>> is not supported". Does anyone have any idea as to what kind of image
>> this is and what software I might need to view it? I tried PICTVIEW,
>> NEOPAINT, and even some Windows 95 JPG viewing programs. None will
>> display it. Please help.
>> Sam Heywood
> What base64 decoder did you use? MPACK/MUNPACK should work. But maybe the
.jpg
> file is farkled? Maybe it's not a real JPG? You might ask your son, the
> sender, if and how he can view the .jpg file.
I used two programs, BASE64.EXE and MIME64.EXE. Both of these are good
decoders and they both return error messages when they find an encoded file
to be farkled. With both decoders the file was decoded without error. Also
Arachne has a MIME64 type of encoder either built in to the system somewhere
or supplied as a separate program. I talked with my son this afternoon on
the telephone and I asked him about it. He said it was just an ordinary JPG
from his own digital camera and that such image files are readily displayed
on all popular image viewing utilities having a capability of displaying
JPGs. He doesn't know why his email client stamped the attachment with the
identity of a PJPEG and he doesn't know what a PJPEG is. He later uploaded
the image to his web site and I retrieved it from there and was able to
view it with no problem. BTW, his web hosting service automatically converts
all uploaded JPG images to GIFs before they become available for viewing
at the website. It had become a GIF before I was able to eventually take
a look at it. I still don't know what a PJPEG is and neither does my son.
Does anybody know what a PJPEG is, and why this ordinary JPG was stamped
as such?
Sam Heywood
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