Why is the same PNG with a width of 927px - 25Kb, and with 930px

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Alexander Panov2011-06-30 14:17:12

Adobe

Alexander Panov, 2011-06-30 14:17:12

Why is the same PNG with a width of 927px - 25Kb, and with 930px - 4Kb?

Both pictures are exported from Photoshop, the difference is 3 pixels in width:

25kb - www.atmateam.ru/sane/red-line.png
4kb - www.atmateam.ru/sane/red-line2.png

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4 answer(s)

H

homm, 2011-06-30
@homm

That's right, because by compressing the image you broke the periodicity of the white borders, which have a complex structure. As a result, instead of repeating 2 sets of pixels, each swirl became unique, and from this much more bytes were spent on encoding them.

A

a3x, 2011-06-30
@a3x

So one of them is 72x72 DPI, and the second is 300x300

D

Dan, 2014-05-21
@golotyuk

Try using PNG optimization tools, then you won't care about it. For example, TinyPNG optimizes pictures online . There is also OptiPNG for desktop work.

M

mark_ablov, 2011-06-30
@mark_ablov

read www.artlebedev.ru/tools/technogrette/img/png-1/ ?