Rev cannot open my jpeg ! - and some serious thinking

[Sarah Reichelt]

>> Me for one. My app Pic-a-POD <http://www.troz.net/Pic-a-POD/> suffers
>> greatly from this problem as more and more large images appear on the
>> internet. At the moment I am forced to check for images with more than
>> 4000 pixels on any side, and if so, I just have to show a notice
>> saying that the image is too big to display.
>
> +1
>
> Pic-a-POD sits on my desktop :-)
>
> "POD" web sites do change their format from time to time, though...
> For instance, National Geographic leads to a "Picture is not in the
> correct format" warning.
> and Wikipedia furnishes regurlarly too big images!

Just to confirm this after some tests:
- the problem is on Mac only
- the height of the image does not seem to matter
- my test image displayed correctly at 4090 x 3000 pixels (72 dpi)
- my test image sometimes displayed correctly at 4091 x 3000 pixels (72 dpi)
- my test image failed at 4095 x 3000 pixels (72 dpi)

I have not yet done enough testing to tell whether the overall number
of pixels or the dpi alters this slightly variable cut-off point.
For Pic-a-POD, I intend to change "Can't display" message so it only
shows if the width of the image is > 4000 and the platform is Mac.

BTW, Dom there is now an update to Pic-a-POD that fixes the National
Geographic problem.

With regard to Wikipedia supplying enormous images, does anyone know a
method for determining the size of a download before it starts? Once
the download has begun the URLStatus gives the total size, but it
would be really useful to get this before starting. I guess I can see
whether I can get a directory listing but I doubt that would be
permitted. The only other option I can think of is to start
downloading invisibly, and stop after the first status report, suing
that data to see whether the incoming image file is too large.

Cheers,
Sarah