Compression question / problem

Richard Miller 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.

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.
>
>
> -- 
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.300 / Virus Database: 265.6.10 - Release Date: 10/01/2005
>
> _______________________________________________
> use-revolution mailing list
> use-revolution at lists.runrev.com
> http://lists.runrev.com/mailman/listinfo/use-revolution
>



More information about the Use-livecode mailing list