Compression question / problem
wow at together.net
Wed Jan 12 13:54:05 EST 2005
We've only been doing this testing so far on OS X. Looks like you were
doing it on Windows. Might work fine there.
On Jan 12, 2005, at 1:49 PM, Alex Tweedly wrote:
> Richard Miller wrote:
>> Looking for the simplest and quickest solution to a compression
>> problem. The goal is to take 50 jpeg images (highly compressed)
>> starting on a Mac, move them to our directory on a hosted web server,
>> then have them downloaded and displayed on a Windows XP machine.
>> Transmission time (over the Internet) is a very big factor here.
>> Here's what we've done so far:
>> 1. Started with 50 jpeg images.
>> 2. Put them into 50 custom properties of a holding stack.
>> 3. Compressed the stack using the RR compress command.
>> 4. Decompressed that stack using the decompress command.
>> 5. Tried to open that stack, but it is always reported as corrupted.
>> 6. The size of the decompressed stack is ALMOST the same as the
>> original stack, but a few bytes short.
>> Also tried this:
>> 1. Took one of these jpeg images.
>> 2. Compressed it with RR compress command.
>> 3. Decompressed it.
>> 4. Tried to open it. It is always corrupt.
>> 5. The size of the decompressed file is the same as the original file
>> size, but in looking at the data in TextEdit, it is readily seen a
>> few characters have shifted places in the first few lines.
>> Suggestions? What's going on here? Thanks.
> The overall description mentioned various different machines - but the
> step-by-step didn't. Is this testing all on one machine ?
> I tried this script
> on mouseUp
> local t, t1
> put URL ("binfile:d:/Our Documents/Alex/RunRev/Photo/IMGP0633.JPG")
> into t
> put the number of chars in t after msg
> put compress( t ) into t1
> put " " & the number of chars in t1 after msg
> put decompress(t1) into t
> put " " & the number of chars in t & cr after msg
> put t into URL ("binfile:d:/Our
> end mouseUp
> and verified that it the output JPG works fine. Might be worth you
> trying it (with suitable file name, of course :-) and then narrowing
> in on any differences between it and your own test script.
> -- Alex.
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