Image optimization quality

Sure. This is an example.

Optimized Image

Original Image

Hi,

thanks for the very nice plugin!

I’m interested in more information about image optimization, too.

Looking at the 2 images you provided above I can see that…

• Resolution is unchanged
• Compression ratio is increased from 1:28 to 1:39
• Color profile is removed
• EXIF data is removed

Questions:

1. How is the higher compression ratio exactly achieved? (which tool)
2. As the image loses quality and meta data, is this destructive or is the original image stored somewhere?
3. What are the plugin’s criteria to decide if an image should be recompressed at all?
4. If an image has already been “optimized” will it be recompressed again (and again) when I click the ‘Optimize All JPEG” button at a later time? Or …

• …does the plugin maintain an index of already optimized images?
• …If Yes, will that index be lost when I temporarly dectivate/uninstall the plugin?

• Do you have any plans to add PNG optimization?

1. Special
2. Yes, if you look at the image url, you can see the folder which is “wpfc-backup”
3. All image are optimized
4. If the image has been optimized via another tool, wpfc optimizes the image again.
– a meta info is added for optimized image
5. Yes

I’m a photographer and this image optimization is useless for me because it makes photos less sharp :/

ok

@emilcabaj

I think you misunderstood “optimization”. Here it’s not meant in terms of quality (‘making the image better’) but in terms of speed (reducing file size).

But, as you certainly know as a photographer, for both things the better solution is always to prepare your images properly before the upload. This (and similar) plugins are quick solutions for people who upload their photos directly from the smartphone and don’t use Lightroom, Aperture, Photoshop, Graphicconverter, etc.

You know better than me but the quality of image is not reduced. Quality is the same.

I’ve made a test run with a couple of images, and of course the quality is reduced. Here is an example pair. It’s clearly visible already at 100%, look at the second window and other details.

But no reason to worry, this is absolutely normal at a file size reduction of 20%! And there’s always the backup folder, in case it is too visible.

BTW, the low res versions (768×1024, 825×510, etc.) have not been changed by the plugin. Is this normal?

Main image has aldready been optimized maybe and other versions are not optimized so wpfc optimizes the versions of image.

No, the other way round. WpFc did recompress the main images but not the small versions. And it was the first run.

More precisely: Some of the small versions are not changed at all (exactly same file length), some are reduced by 0.1kB or so. (But all the main images have been reduced by >100kB.)

may be

?

What may be? Do you mean that it is normal?

yes it could be. Don’t worry. If you want, you can try to optimize the small images via another optimization tool. You see that other optimization tools cannot reduce the size of file enough.

Main image has aldready been optimized maybe and other versions are not optimized so wpfc optimizes the versions of image.

To be sure I’m following you here, do you mean your plugin will not touch images that are already optimized?

My issue: The images I upload to my server are already optimized by me; small file size (well under 50KB) and images no larger than 600×400. Yet the WP versions of those images are larger in file size. i.e. original upload 600×400 = 42KB, WP version 476×328 = 50KB. (NOTE: I upload my images to server via cPanel, then to WP using Add from Server plugin)

I think this is due to an update of my theme, which I’m going to try and revert back to the older one today. If that doesn’t cure my issue, I will need something to fix it.

Also can I opt not to optimize images? Does your plugin optimize only those that need it and/or those I choose? Thanks!

My issue: The images I upload to my server are already optimized by me; small file size (well under 50KB) and images no larger than 600×400. Yet the WP versions of those images are larger in file size. i.e. original upload 600×400 = 42KB, WP version 476×328 = 50KB. (NOTE: I upload my images to server via cPanel, then to WP using Add from Server plugin)

In this case, WPFC must optimize 476×328 version. Didn’t WPFC optimize?