Jump to content

Recommended Posts

I was reading an article about sizing images for Facebook and ran across the following "JPG is generally used for images with blended tones, like photos, and GIF and PNG are better for images of flat tones like logos, text and graphics."

I've never heard this assertion before and can't imagine why it would be true, but I'm not an expert. What say ye?

Windows 10 Pro, XP-Pen Deco 03, AP & AD

Share this post

Link to post
Share on other sites


Due to the fact that Boris Johnson is now our Prime Minister, punctuation, spelling and grammar will never be worried about ever again.  We now have far bigger problems to be worried about.

Share this post

Link to post
Share on other sites

Some comments. Rake w. grains of salt,

.GIF is a really old format, and can only offer 256 colors. Gradients must be dithered, and edge blending is likewise ragged. So simple forms w. a small number of colors are well suited for .gif. The format is 8-bit, and so tends to be small by contemporary standards.

.PNG was developed to replace .gif, but  accommodates up to 64-bit color depth. In images w. few colors, the .png routine can produce files smaller than .gif. But for images w. greater bit depth the files can become much larger. While ,png will ignore any colors not present, any of the million that are there will be recorded. The format us considered lossless. Add to that the space for transparency, and metadata, and the file size balloons. 

Also, at one time, the amount of computation necessary for the encoding was noticable. 

,JPG is considered lossy, although when the quality is set to 100%, it creates files of about the same size as .png. As compression increases, the routines average areas of color, and use methods that keep the image looking smooth to the eye. Lots of colors, and smooth smears for color gradations. Only at high compression that the artifacts become obvious. The artifacts will be there even for simple forms, so a highly compressed .jpg well not be so good for a geometric shape.

iMac 27" Retina, c. 2015: OS X 10.11.5: 3.3 GHz I c-5: 32 Gb,  AMD Radeon R9 M290 2048 Mb

iPad 12.9" Retina, iOS 10, 512 Gb, Apple pencil

Huion WH1409 tablet

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

Please note the Annual Company Closure section in the Terms of Use. These are the Terms of Use you will be asked to agree to if you join the forum. | Privacy Policy | Guidelines | We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.