image.md

Image

Get info on image

• file $f: type, and for certain formats size other major parameters such as depth.
• ImageMagick identify -format $f

Editors

Gimp.

Inkscape

Good SVG GUI editor.

Dia

GNOME diagram editor

Viewers

eog

Eyes of GNOME.

Lightweight image viewer:

eog a.jpg

img2txt

Convert image to ASCII art.

caca-utils package.

Stdout output:

img2txt a.jpg
img2txt -W `tput cols` a.jpg

• -W: width

caca view

img2text on X window:

cacaview a.pjg

aview

Converts image to ASCII art! Not as good as img2txt.

Works only with Netpbm formats.

Seems to do black and white only:

asciiview a.jpg

And changing the width was not working for me:

asciiview -width a.jpg

Utilities

ImageMagick

ExactImage

ImageMagick competitor, supposedly faster. C++ template API.

caca-utils

Contains img2txt.

dvipng

Convert DVI to PNG.

Important application: LaTeX -> DVI -> PNG -> website.

Misc

Color spaces

• https://en.wikipedia.org/wiki/SRGB

• https://en.wikipedia.org/wiki/HSL_and_HSV

• https://en.wikipedia.org/wiki/YUV

Related concepts:

• https://en.wikipedia.org/wiki/Chromaticity

• https://en.wikipedia.org/wiki/CIE_1931_color_space 1931 CIE

• Human vision sensitivity per cone type: https://en.wikipedia.org/wiki/CIE_1931_color_space#/media/File:Cones_SMJ2_E.svg

• https://en.wikipedia.org/wiki/RGB_color_model

• https://en.wikipedia.org/wiki/Secondary_color

• https://en.wikipedia.org/wiki/Additive_color https://en.wikipedia.org/wiki/Subtractive_color

• https://en.wikipedia.org/wiki/Chroma_subsampling