"We are going to build a wall" DT 2K17 by Simon Ryder

"We are going to build a wall" DT 2K17 by Simon Ryder https://padlet.com/simon_ryder15/ejjwfgcdllhe en-us 2018-01-19 09:27:59 UTC 2019-02-02 11:36:36 UTC hello@padlet.com Advantages of the GIF format timothymkelly https://padlet.com/simon_ryder15/ejjwfgcdllhe/wish/222707479 Which browsers support GIF?
All major browsers such as Mozilla Firefox, Safari, Internet Explorer and Chrome support GIFs.

Can they have transparent backgrounds?
Yes, but they will be given 'halos' which will be visible.

What is interlacing, does GIF support it?
Interlacing is something that makes images load odd or even lines first, and then loads the rest of the lines on the next cycle.

What client software needs to be installed to view a GIF?
A web browser such as firefox, as Windows does not come with a default program to open them.

How does the lossless LZW's data compression affect GIF images? The LZW's data compression makes the GIF files compressed and makes the file size smaller.

How would you describe the file sizes of GIFS?
The file size of GIFS is good as it has a limited colour palette. This means that the file size will be kept down due to the low amount of colours possible to have.]]> 2018-01-19 09:30:23 UTC https://padlet.com/simon_ryder15/ejjwfgcdllhe/wish/222707479 History simon_ryder15 https://padlet.com/simon_ryder15/ejjwfgcdllhe/wish/222708034 The GIF graphics file format was invented by Steve Wilhite at CompuServe in 1987

Correct way to pronounce "GIF": like "jif" as in the peanut butter, or with a hard 'g' as in "gift" as a majority of Mac users seem to prefer.

There is no special patent threat to GIF format nowadays as far as we know; the patents that were used to attack GIF have expired.

Who created the format - Steve Wilhite American computer scientist

Who introduced the format? CompuServe founded in 1969 and the headquarters are in Ohio USA

When was it created? - in 1987

What controversy surrounds the format - patent enforcement The PNG format (see below) was developed in 1995 as an intended replacement the patent format isnt in place to date

Which patent is involved. - LZW compression patent - (Lempel–Ziv–Welch) granted in December 1985 LZW became a popular data compression technique and, when the patent was granted

Who holds the LZW patent - Unisys

What format was introduced to overcome the patent issue? - PNG (Portable Network Graphics)

]]> 2018-01-19 09:32:46 UTC https://padlet.com/simon_ryder15/ejjwfgcdllhe/wish/222708034 Disadvantages of the GIF format ada17000704 https://padlet.com/simon_ryder15/ejjwfgcdllhe/wish/222708108 Only have a palette of 256 colours so therefore can sometimes look of a poorer quality than other types of file or image.

Dithering

Dithering is used in computer graphics to create the illusion of "color depth" in images with a limited color palette - a technique also known as colour quantization. Dithering can vastly increase the file size.

How would you reduce GIF animation file size
Use a reduced range of colours, reduce number of frames, reduce dimensions, avoid dithering and don't use interlacing.

Can GIFs be opaque rather than transparent
the GIF format doesn't support partial (alpha-channel) transparency, meaning any pixel can only be fully tansparent or fully opaque

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