Questions about reducing a file's size by automated pattern recognition, and the resulting changes in image quality.

learn more… | top users | synonyms

14
votes
9answers
63k views

Facebook: Ways to preserve image quality of uploaded images?

After uploading an image, Facebook converts it to a new image. Their conversion process introduces artifacts and mottling to the magenta-ish parts of the image. Original image: Facebook's ...
7
votes
4answers
4k views

The most advanced JPEG image compression on mac?

Sometimes i work with JPEG files for my web designs. There are occasions where the PNG format is not suitable.. There are several optimization techniques for the PNG format, but I noticed that for ...
6
votes
9answers
2k views

Tools for *lossy* PNG compression?

I'm trying more and more to get by sans PhotoShop for my personal/freelance work. I do primarily web work these days and don't do enough side gigs to justify keeping up with the Creative Suite beast. ...
5
votes
4answers
2k views

Why do JPEG files blur red more than other colors?

I am trying to figure out why JPEG compression causes noise in the red spectrum that is larger and fuzzier in regards to, say, the blue spectrum. I've seen this question and I am not looking for a ...
4
votes
2answers
3k views

Google Play - 'Feature Graphic' Design

I recently got my application in the google play store, but I have an issue with how the 'Feature Graphic' is being displayed. Here is the original (@ 72 DPI (Screen RES) - Saved for Web - PNG8): ...
4
votes
4answers
1k views

PNG vs GIF for 1 bit transparency

Is there any reason for using GIF instead of PNG when the image requires only 1 bit transparency (either on or off) and of course no animation is required? thanks
3
votes
2answers
128 views

Better image compression by combining images?

What is the name of the technique where many small images are copied into one large image to get better compression and avoid loading many separate images int memory? And is this still useful in ...
3
votes
2answers
2k views

How to reduce the size of a (chinese) .ttf font file?

I have a Chinese font file, the size of the file is 7.693 MB. Due to the size of the ttf file, the site loads only slowly. Is there any way to reduce the size of the .ttf font?
3
votes
2answers
8k views

How to compress an animated GIF?

I have an animated gif banner 125x125 that needs to be < 10 KB. I started at 60 KB and my best efforts (remove all animation, reduce number of frames) resulted in 28 KB. Any ideas how to make it ...
3
votes
2answers
272 views

How to fill with similar colours?

I have this image that have been damaged by JPG, and would very much like to restore it, as if it had never been compressed with JPG. Can someone help me with this? I assume I need to fill with ...
3
votes
2answers
219 views

Why JPEG files saved in my digital camera are higher size vs JPEG files saved in my computer?

When I took pictures using my digicam, it saves those on higher size (over 1 MB) JPEG files. What I usually do is that I open them on some image editing application such as Paint (windows) or Preview ...
2
votes
2answers
463 views

Photoshop: How to use a non-white background as the basis for semitransparent layers in PNG8 export?

PNG8 is a great compressed format when we don't really need semi-transparency. Often an asset will have semi-transparency data that we're happy to lose in the export process, however Photoshop ...
2
votes
3answers
790 views

Photoshop Reducing File Size by Hiding Layers

I've recently learned that hiding Photoshop layers will reduce the file size. After searching around the Adobe forums I can't find anything stating this. There are only about half a dozen sites on ...
1
vote
1answer
296 views

How can I remove compression artifacts around text?

Example: This seems to be a problem with using JPEG. My questions are: How to remove the grey areas around the text? What filter/process in GIMP/ImageMagick or other free image ...
1
vote
3answers
6k views

image in illustrator compression script

I have a very High resolution image in illustrator, which leads to a very heavy eps file size, I'm asking for a batch tool or a script to compress the eps image , in other words reduce its resolution ...
0
votes
3answers
4k views

Create jpg image with good quality

I'm trying to save a jpg image but it's getting a bit blurred. I have it nicely in my image editor, but saving the image is not giving the quality I need, even with max quality defined. If I save it ...
0
votes
6answers
427 views

Need png optimisation/compression advice

I have a large set of png images I am trying to compress and I would like some advice from all of the graphics experts out there :) on the best method to do this. I have access to both a Mac and ...
0
votes
1answer
71 views

Image compression - what is the best way?

What is the best way to compress images to satisfy Performance Review on Web Page Speed test on webpagetest.org. Here's how I do it: 1) Save for Web in Photoshop from original PSD with quality set ...
0
votes
4answers
148 views

How to reduce the filesize of an image without altering its dimensions?

I have a 5760px x 3840px image with a filesize of1.14MB. I would like to reduce its filesize to 200KB without altering its dimensions. How can I do this in Photoshop?
0
votes
0answers
17 views

Illustrator - Large Vector File to Print at A0

I have created large vector drawings for A0 printing - each file has thousands of vectors at different transparencies. The largest file is 270mb when saved as an editable pdf. I have not compressed ...
0
votes
0answers
41 views

Compress png images with Gimp

I'm getting a message from PageSpeed Insights that recommends to compress some png images. E.g: If compressing .../logo.png without loosing information, you would save 1.014 B (12% redcuction). ...
0
votes
0answers
219 views

Purple text on dark background too blurry when uploading to facebook (saved as png)

I'm going nuts here. I'll try to be straight to the point. I'm using Photoshop CC and have this dark background image for a poster with some text info. Sentences in white, three infos in purple, ...