Unified Dyes expands the standard dye set from 15 to up to 256 colors (depending on the object to be colored)
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README

VanessaE's Unified Dyes
=======================

The purpose of this mod originally was to supply a complete set of colors for
Minetest mod authors to use in their recipes. Since the default dyes mod that
is supplied with Minetest "common" is now usable (via flowers, also included in
"common"), this mod has become more of an extension pack.

Unified Dyes expands the standard dye set from 15 to 90 colors.

IMPORTANT: This mod is not intended to suggest that you should use the entire
palette. Rather, I was hoping people would just choose maybe the dozen or so
most useful colors to use in their mods.

Dependencies: default and dye from Minetest "common". This mod will NOT work
without these. This mod will NOT work without these. The default dye mod is
normally activated only in the standard "build" and "minetest_game" games, or perhaps if
someone has a modpack or game that includes them.

Recommends: flowers from common.

License: GPL 2.0 or above

Install: Unzip the distribution file, rename the resultant
VanessaE-unifieddyes-blahblah folder to just "unifieddyes", and move it into
Minetest's mods folder.

The Palette:

[ http://digitalaudioconcepts.com/vanessa/hobbies/minetest/screenshots/color-swatches.png ]
[ The official palette, showing 84 colors and 5 greys. ]

In the image above, the "50%" markings on the left next to each shade mean 50%
saturation for all hues in that shade line. Note that the "light" shades don't
have (or need) that variant. For the greys, the percentages shown are of
brightness relative to pure white. There are three special cases: Light red
has been aliased to default pink dye, and dark green has been aliased to
default dark greey dye. Brown dye also exists in the default set, it's just
not shown in the palette above.


Usage instructions, technical information
=========================================

Getting Started
---------------

First thing's first: you're going to need to harvest some materials to make the
dyes from. For this, you need one or more of the following: roses (red),
tulips (orange), yellow dandelions (yellow), cactus (green), geraniums (blue),
violas (purple), coal (black), or white dandelions (white). Simply wander
around your world and collect whichever of the above you need to get your
colors.

[ http://digitalaudioconcepts.com/vanessa/hobbies/minetest/screenshots/unifieddyes1.png ]
[ The 8 base colors directly obtainable from a material in the world. ]

Simply place one of the above materials into the crafting grid to obtain four
portions of dye in that color From those initial 8 colors, you can directly
fashion another 11, for a total of 19 standard colors (including the various
greys):

[ http://digitalaudioconcepts.com/vanessa/hobbies/minetest/screenshots/unifieddyes2.png ]
[ The complete 19-color standard set. ]

The standardized colors and their crafting methods are as follows:

* Red (0°): one rose
* Orange (30°): one tulip, or put one red dye and one yellow dye into the
crafting grid to mix them (yields 2)
* Yellow (60°): one yellow dandelion
* Lime (90°): mix yellow + green (yields 2)
* Green (120°): one cactus, or mix yellow + blue (yields 2)
* Aqua (150°): mix green + cyan (yields 2)
* Cyan (180°): mix green + blue (yields 2)
* Sky blue (210°): mix cyan + blue (yields 2)
* Blue (240°): one geranium
* Violet (270°): one viola, or mix blue + magenta (yields 2).
* Magenta (300°): mix blue + red (yields 2)
* Red-violet (330°): mix magenta + red (yields 2)

* Black (7.5%): one piece of coal
* Dark grey (25%): mix one white + two black (yields 3)
* Medium grey (50%): mix one white and one black (yields 2)
* Light grey (75%): Mix two white and one black (yields 3)
* White (95%): one white dandelion.

The degree figures are the colors' hues on a standard HSV color wheel, and are
what I used in the textures supplied with this mod. For the greys, the figures
in parenthesis indicate the intended brightness of the shade, relative to
white. Note that black and white don't go all the way to the bottom/top of the
scale, as doing so may crush some details in textures made in those shades (see
below, regarding semi-automatic texture generation).


Darker/Lighter colors
---------------------

To obtain a dark (33%) version of a given color, use two portions of black dye
along with the base color from the list above, which yields three portions of
the final color.

To obtain a medium-brightness (66%) version of a given color, mix one portion
the base color with one portion of black dye (for example, medium lime = lime +
black). All such mixtures yield two portions of the final color.

To obtain a light (150% over full) version of a given color, mix one portion of
the base color with one portion of white dye. Yields 2 portions of the final
color.


Low-saturation colors
---------------------

To get the low saturation (50%) version of one of the base colors, mix one or
more of white, black, or a shade of grey with the desired base color:

Dark, low saturation: dark grey dye + color (yields 2), or two blacks + 1 white
+ color (yields 4). For example, dark, low-saturation red = red + dark grey,
or red + two black + one white.

Medium brightness, low saturation: medium grey dye + color (yields 2), or black
+ white + color (yields 3). For example, medium, low-saturation green = green
+ medium grey, or green + black + white.

Full, low saturation: light grey dye + color (yields 2), or 1 black + 2 whites
+ color (yields 4). For example, bright, low-saturation blue = blue + light
grey, or blue + black + 2 white.

There is no low-saturation version of the "light" colors.

Red + white always returns default pink dye, and black + green always returns
default dark green dye.


RGB values
----------

All RGB values and filenames for all colors and shades of grey are represented
in the file "colors.txt" (which was generated with the bash script
"listcolors.sh"), included in the distribution directory. Note that
listcolors.sh is an example only and was written for a different set of
textures than what Unified Dyes includes now.


Misc. Notes
-----------

If you need to use /give commands, the item names for the standard set of 12
regular "full" colors (plus pink, brown, and dark green) is simply "dye:color",
e.g. "dye:red", "dye:pink", or "dye:skyblue". Greys have a similar naming
convention: dye:white, dye:light_grey, dye:grey, dye:dark_grey, or dye:black.

For everything beyond those initial 19 colors, the item names are of the
following format:

unifieddyes:{"light_" or "medium_" or "dark_"}{color}{nothing or "_s50"}.

For example, low saturation dark yellow is "unifieddyes:dark_yellow_s50", while
light normal-saturation red-violet would be "unifieddyes:light_redviolet".

See the texture filenames in the textures/ folder for further hints - all of
the item names follow the same format as the corresponding filenames, save for
having a colon (:) instead of the first underscore (_).


Semi-automatic generation of textures
=====================================

The texture generator script
----------------------------

Obviously, in order for this mod or the above template to be useful, you'll
need textures. If you plan to support the entire range of colors offered by
Unified Dyes, there is a BASH script included with this mod as well with the
above template named gentextures.sh, which will, with an appropriately- colored
and appropriately-named source texture, and possibly an overlay texture,
generate a complete set of colored and greyscale textures.

The script requires bc (the calculator program) to handle some basic math
regarding the hue adjustments, and Imagemagick's "convert" program handles all
of the actual conversions.

First thing's first though - you need source textures. Using your favorite
image editor, create a single version of your desired texture. Draw it in the
brightest, deepest shade of RED you can muster without losing any detail, and
save it out. Ideally, you will want the average color of the texture, when
taking into account all bright and dark areas, to be as close as possible to
the hex value #FF0000 (0 degrees, 100% saturation, pure red) without losing any
appreciable #detail.

Save this source texture out as a PNG image, with a filename of
"whatever_base.png", where "whatever" is the one-word name of your mod - for
example, mymod_base.png.

If you want to add an image on top of the colored blocks, such as a frame,
which you want to be the same color throughout all of the textures, create it
now. It should consist only of those parts of the textures that you want to
leave unchanged, with some level of alpha transparency everywhere else,
depending on how much of the image needs to remain unchanged. Save it out as a
PNG image, using any filename you want, for example myoverlay.png.

Now, use chmod to make the script executable, if necessary, and run it.

If you don't need the overlay, you just need to supply one command line
argument: the base name of your mod. The script will use that parameter as the
basis of its texture filenames. For example:

./gentextures.sh mymod

The script will then look for mymod_base.png and copy and convert it into
things like mymod_red.png, mymod_dark_blue.png, and so on.

If you want to use an overlay also, skip the above step and run the script with
the base name as the first parameter, and the complete filename of your overlay
as the second instead. For example:

./gentextures.sh mymod myoverlay.png

Otherwise, the program will iterate through all of the hues and shades that are
supported by unifieddyes (though this is done manually, not by reading anything
from the mod), compositing your overlay image in after the recolor step, if
you're using that option.

All of the output files will be placed in a new folder, generated-textures/ in
the current directory. Note that the script looks for the above files in the
current directory also.

The script has a third mode as well:

./gentextures.sh -t mymod myoverlay.png

In this mode, the script will leave the base texture mymod_base.png unchanged,
and instead will rotate the colors of the overlay image and then composite that
onto the base texture. The same color changes will happen with the overlay in
this mode, so it's a good idea to make the overlay some fairly saturated shade
of red. Along with that, the base image should be some neutral color; any
color is fine as long as the result is what you wanted.

The program attempts to verify that the files you've asked it to use will
actually work, and will exit immediately if the any are invalid, missing, etc.

Use your favorite image browser or file manager to review the results in
generated-textures/, and if they're right, copy them over to the textures/
folder in your mod.

Note that this script does not generate brown and pink variations of your base
texture - you'll have to do those two manually.