Compression question / problem

[Richard Miller]

We've only been doing this testing so far on OS X. Looks like you were 
doing it on Windows. Might work fine there.

Richard


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 
> Documents/Alex/RunRev/Photo/IMGP0633-x.JPG")
> 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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