[RESOLVED] Zip .jpg after upload

TeamTJ

I have a site where users can upload images and then anyone can download them.

It works fine but I'm running out of space.

What I'd like to to is:
1) user uploads file
2) thumbnail created
3) original file zipped up
4) original file deleted

This would save me a ton of space.

I have 1 & 2 done. I have no idea how to do #3, though.

Any pointers?

cheerio

http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=957&lngWId=8

etully

If you zip a JPG, it doesn't compress at all. In fact, it gets bigger by 10-100 bytes.

Try it before you build an automated tool on your site.

TeamTJ

I tried that code but get:

Parse error: parse error, unexpected T_STRING in /home/cardsget/public_html/zipper.php on line 45

Line 45 is:

$fr = "x50x4bx03x04";

I'm sure it's something I'm doing wrong, but I don't see what...

TeamTJ

etully wrote:
If you zip a JPG, it doesn't compress at all. In fact, it gets bigger by 10-100 bytes.

Try it before you build an automated tool on your site.

I just zipped a 1,578KB .jpg on my PC and it came out 989KB. 😕

cheerio

I have never ever tried that zip class or anything, sorry. You can just use imagejpeg($image,false,75) where 75 is the quality.

TeamTJ

I had a slightly different version of the code that must have had a bug in it. With the corrected code, I can create the zip file.

What I don't know how to do is this part:
// add the binary data stored in the string 'filedata'
$filedata = "(read your file into $filedata)";

How do I "read" the .jpg file into that variable?

Thanks!

EDIT: nevermind. I am a moron and figured it out.

etully

Sorry - I should have qualified my statement.

A very large percentage of the time, a JPG is already compressed as far as it will go. In those cases, when you zip it up, you gain a few bytes for the overhead of the zip file itself.

In your example, yes, a large JPG where the Quality was left high, a compression will have a benefit.

Sorry, I should have been more clear.

As for the syntax error, look on lines before and after line 45. For example, if you leave out a quote, semicolon, or a parenthesis, the line that PHP reports isn't always the line that has the problem.

TeamTJ

etully wrote:
Sorry - I should have qualified my statement.

A very large percentage of the time, a JPG is already compressed as far as it will go. In those cases, when you zip it up, you gain a few bytes for the overhead of the zip file itself.

In your example, yes, a large JPG where the Quality was left high, a compression will have a benefit.

Sorry, I should have been more clear.

As for the syntax error, look on lines before and after line 45. For example, if you leave out a quote, semicolon, or a parenthesis, the line that PHP reports isn't always the line that has the problem.

That makes sense. Thanks for the info. In my case, these images are high quality, so they compress well.

Weedpacket

etully wrote:
Sorry - I should have qualified my statement.

I've found that Photoshop has a tendency to shovel large amounts of rubbish into the JPEG's metadata - big pages of plain uncompressed XML for example (which kinda makes a mockery of the point of using JPEG in the first place, reckon?). Just wondering if Photoshop is involved in this process at all....