Why transparent pixels add so much to the size of the file?

no doubt and I hope that I simply don't see something simple here, maybe it's just how things are but I have to say that I don't know why they are it seems strange...

the thing is when I save an animated gif (except for the web...) I find that if I use a single color background clear size may be radically different when you use the transparency option, if it is turned on (while the non-transparent pixels are accordingly, white Uni) I'll see normall about half the size of the resulting file that I had chosen to have this not selected (using the same origin).

now, if I really want to use transparent pixels in the gif, the result will be a file size double than with a background fill.

so my question, why is this? Is there a cure? So then what?

now added screenshots... These are all using the same graph, the size of the file is comparable between the images labelled 1 and 2.  Strangely, the output size goes backwards when I try this graph with 16 colors...

photoshop_saves_tiny.png

Post edited by: nt5bys, added the Visual content and description

Hi nt4bys,

Space empty and transparent is information as well. If a PNG image has an alpha channel, each pixel is made up of denunciations (r, g, b, a) for components red, green, blue and alpha. In the case of a transparent pixel, only alpha is simply 0, but it is information that is present in the file. That said, you want to minimize background or edge of transparency which can be cropped out of the picture of the moose. There are also tips and tricks to save files and the lowering of the size of the file. For example, http://tinypng.org is a site that allows you to reduce the size of your PNG via a service.

Hope that helps!

Clarice

Tags: Photoshop

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