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[RESOLVED] imagejpeg quality 100, increases filesize beyond original filesize?

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May 22.2010

Hello,

I’m now using imagejpeg to output images at 100% quality level. However, this increases the filesize beyond the original filesize of the original image by a lot.

For example, I have image.jpg:
1. image.jpg optimized for web in Photoshop at JPEG High 70% -> creates a file at around 125kb
2. Runs through the following script:

[code=php]
$imagepath = http://site.com/path/to/image.jpg;
$image = imagecreatefromjpeg($imagepath);
header(‘Content-Type: image/jpeg’);
imagejpeg($image, NULL, 100);
[/code]

3. Outputs image.jpg at a filesize of 600kb

After reading through some tutorials online, I understand that it’s not supposed to be possible to increase quality beyond its original source…so how is this possible?

Any help would be greatly appreciated. Thanks!!

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PHP

3 Comments(s) ↴

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@QwertmanMay 22.2010 — I'm pretty sure that 100% doesn't mean you're setting it at 100% of whatever the current quality is, but rather 100% possible quality. Therefore if you're saving a file with quality 70% it's size will go up since it's increasing it by 30%. It's easier to think of it as just a score where 100 is the best quality- forget the % sign.
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@Jarrod1937May 22.2010 — Keep in mind too that filesize does not mean quality. You can bloat the filesize and have the same or worse quality.
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@boxofmochiauthorMay 22.2010 — Is there a way to shrink the filesize but keep the quality level at 100?

Or at least shrink the filesize back to its original, and keep the quality level at 100?
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