EVOLUTION-MANAGER

Edit File: NEWS.md

# colorspace 1.4-1 * New article/vignette "Somewhere over the Rainbow" with published examples of RGB rainbow palettes (or similar highly saturated and non-monotonic palettes). * Bug fix in `divergingx_hcl(n)` with even `n` where the two central colors were erroneously duplicated. Also, partial matching of palette names has been fixed. * New sequential multi-hue palette: Purple-Yellow. This is a slightly improved version (i.e., with higher luminance contrast) of the palette used in Figure 4 of [Stauffer _et al._ (2015, BAMS)](https://dx.doi.org/10.1175/BAMS-D-13-00155.1). * New flexible diverging palette Zissou 1 in `divergingx_hcl()`. This closely matches the palette of the same name in _wesanderson_. Note that this is rather unbalanced, has relatively low luminance contrasts and uses very high chroma throughout. * New palette Cividis in `divergingx_hcl()` approximating the palette of the same name from the viridis family. While luminance increases monotonically from dark to light in the palette (thus indicating a _sequential_ and not a _diverging_ palette), the hue and chroma trajectories resemble a diverging pattern. Therefore, the flexibility of `divergingx_hcl()` is needed and the palette could not be approximated by `sequential_hcl()`. * Limits of hue axis are improved in `specplot()`. Previously, the hues were always matched to [0, 100] on the chroma/luminance axis. Now they are matched to [0, maximum chroma]. # colorspace 1.4-0 * Major update of the package that enhances many of its capabilities, e.g., more refined palettes, named palettes, ggplot2 color scales, visualizations for assessing palettes, more and enhanced shiny and Tcl/Tk apps, color vision deficiency emulation, and much more. See below for further details. A new web site presenting and documenting the package has been launched at http://colorspace.R-Forge.R-project.org/ * Claus O. Wilke and Claire D. McWhite joined the _colorspace_ team, adding and enhancing various features, including (but not limited to) especially the color vision deficiency emulation, the _ggplot2_ palettes, and new shiny apps. * New function `simulate_cvd()` for simulating color vision deficiencies with convenience interfaces `deutan()`, `protan()`, and `tritan()`. * New function `hcl_palettes()` to query pre-defined HCL-based palettes: qualitative, sequential (single-hue), sequential (multi-hue), diverging. The corresponding `print()`, `plot()`, and `summary()` methods can help to explore the palettes. * Pre-defined HCL palettes are taken from previous publications about colorspace as well as approximations from other packages (ColorBrewer.org, CARTO, viridis, scico). * Users can also register their own custom color palettes for subsequent usage (within the same session) in `qualitative_hcl()`, `sequential_hcl()`, and `diverging_hcl()` using the `register = "..."` argument. To generally make such custom palettes available, a registration R code a la `colorspace::qualitative_hcl(..., register = "myname")` can be placed in the `.Rprofile` or similar startup scripts. Also the `choose_color()`/`hclwizard()` app allows to register palettes in the current session. * New and more flexible `qualitative_hcl()` palette function. This is similar to the old `rainbow_hcl()` but allows to use the pre-defined palettes and change the parameters more easily. * Palette function `sequential_hcl()` is now substantially more flexible: encompasses both single-hue and multi-hue palettes; gained a new parameter `cmax` for non-monotonic chroma paths. Parameters `h1`, `h2`, `c1`, `c2`, `l1`, `l2`, `p1`, `p2`, `cmax` allow to easily modify existing palettes in just a few HCL parameters. * Function `diverging_hcl()` is introduced as a copy of `diverge_hcl()` for a more consistent naming of the *_hcl palettes where * is one of the adjectives "qualitative", "sequential", and "diverging". Both `diverging_hcl()` and `diverge_hcl()` now also gained a `cmax` argument just like `sequential_hcl()`. Individual parameters `h1`, `h2`, `c1`, `l1`, `l2`, `p1`, `p2` can also be easily modified. * New functions `divergingx_hcl()`/`divergex_hcl()` have been added for fully fle_x_ible diverging palettes (as opposed to the more restricted balanced palettes in `diverging_hcl()`/`diverge_hcl()`). These support parameters `h1`, `h2`, `h3`, `c1`, `c2`, `c3`, `l1`, `l2`, `l3`, `p1`, `p2`, `p3`, `p4`, `cmax1`, `cmax2`. * Many new predefined palettes that facilitate close approximation of almost all palettes from _ColorBrewer.org_/_RColorBrewer_, _CARTO_/_rcartocolor_, and viridis. Additionally, approximations to a few of Fabio Crameri's scientific color maps (_scico_) are available as well. * New interactive shiny app `hcl_color_picker()` - or equivalently, `choose_color()` - for exploring HCL colors, and manually assembling individual colors or palettes. Douglas C. Wu (@wckdouglas) provided the original implementation for the color palette feature. * New functions `lighten()` and `darken()` for programatically lightening and darkening colors. * New convenience function `swatchplot()` that facilitates displaying color swatches to display and compare collections of color palettes. * `specplot()` gained an argument `y=NULL` to optionally display a second palette and compare their trajectories. By default, `specplot()` now only shows the HCL spectrum but not the RGB spectrum (`rgb = FALSE`) because it is mainly used for illustrating and comparing properties of HCL-based palettes. * New function `hclplot()` for visualizing trajectories of color palettes in two-dimensional HCL space projections. * New function `demoplot()` that makes the demonstration plots (map, heatmap, pie, lines, etc.) from the `choose_palette()`/`hclwizard()` app available outside the GUI on the command line. * Added a new function `max_chroma()` that (approximately) computes the maximum chroma possible for a given hue and luminance combination in HCL space. * Registration of C routines. * In `LAB_to_XYZ` conversion, replace decimal approximations with exact rational numbers (reported by Glenn Davis). Follows Bruce Lindbloom: <http://brucelindbloom.com/index.html?LContinuity.html> * New function `whitepoint()` that can both query the current whitepoint and set it to a different value. By default CIE D65 with XYZ coordinates 95.047, 100.000, 108.883 is used. But it is possible to set another global whitepoint now, used for all conversions in the package (suggested by Glenn Davis). * Fixed a bug in `desaturate()` for named colors (such as `"gray92"`) where erroneously the `RGB()` rather than `sRGB()` model was used internally. * Added argument `desaturate(..., amount = 1)` for optional partial desaturation. # colorspace 1.3-2 * Fixed error in `as_HLS()`, which was passing `ans` rather than `color` as the colour to convert (and that was producing not only wrong results, but random results because the values in `ans` were not initialized). Thanks to Thomas Julou for the report. # colorspace 1.3-1 * Fixed erroneous use of `return` rather than `return()` in `choose_palette()`/`hclwizard()`. # colorspace 1.3-0 * In addition to the Tcl/Tk-based GUI for `choose_palette()` there is now a shiny-based GUI. `choose_palette()` by default still uses the Tcl/Tk version while `hclwizard()` is a new wrapper that by default calls the new shiny version. * New function `specplot()` that converts a given palette in hex codes to RGB and HCL coordinates and visualizes their spectrum as a line plot. * `hex2RGB()` now omits the alpha channel (if any) in the hex colors provided. # colorspace 1.2-7 * Extended `choose_palette()` for sequential palettes with multiple hues: Now two palettes are included in the examples that are very close to "viridis" and "magma" from matplotlib in Python (also available in R via package _viridis_) * Changed Depends/Imports/Suggests to conform with current R CMD check. # colorspace 1.2-6 * Moved _tcltk_ again from Imports to Suggests to facilitate usage of colorspace on platforms where tcltk is not available. # colorspace 1.2-5 * Changed Depends/Imports/Suggests to conform with current R CMD check. # colorspace 1.2-4 * Bug fix for `choose_palette()` when using palette functions with optional alpha channels. # colorspace 1.2-3 * Alpha channel is preserved in desaturate for named colors (especially `"transparent"` and `NA`). (Reported by Simon Potter.) * Added alpha argument for all palette functions (see `?rainbow_hcl`). * Small fixups for R CMD check. # colorspace 1.2-2 * Names of colors are preserved in `hex()` and `hex2RGB()` now. (Reported by Richard Cotton.) # colorspace 1.2-1 * If a new version of the _dichromat_ package (> 1.2-4) with tritan support is found, this is interfaced in `choose_palette()`. # colorspace 1.2-0 * New Tcl/Tk-based GUI for choosing different types of palettes: qualitative (`rainbow_hcl`), single-hue sequential (`sequential_hcl`), multi-hue sequential (`heat_hcl`), and diverging (`diverge_hcl`). The GUI provides a wide collection of pre-stored palettes, easy manipulation of the corresponding arguments, illustration through a broad range of plot types (maps, heatmaps, variations of bar plots, scatter plots, and many more), emulation of desaturation and dichromatic vision, loading/saving palettes, etc. * Bug fix in `polarLAB_to_LAB` conversion. * All `.Call()` calls now with `PACKAGE = "colorspace"`. * Added some simple tests based on the examples and vignette. # colorspace 1.1-1 * Added `desaturate()` function for removal of chroma in a given vector of colors. * Bug fix in `HLS_to_RGB` conversion for `s == 0`. # colorspace 1.1-0 * Added `sRGB` colorspace. (Existing `RGB` colorspace is linearized "sRGB".) * Conversions to and from `HSV` and `HSL` can only occur from or to `RGB` or `sRGB` (because both `HSV` and `HSL` are relative colorspaces, meaning relative to a particular RGB colorspace). (Converting to or from `RGB` gives a different result compared to conversion to or from `sRGB`.) * All `gamma` parameters in all R-level functions have been deprecated. (The `sRGB` colorspace has implicit gamma.) # colorspace 1.0-1 * "Escaping RGBland" paper is now published _Computational Statistics & Data Analysis_ as [doi:10.1016/j.csda.2008.11.033](https://doi.org/10.1016/j.csda.2008.11.033). Citation and references updated accordingly. # colorspace 1.0-0 * New version to accompany the "Escaping RGBland" paper accepted for publication in _Computational Statistics & Data Analysis_, see `citation("colorspace")` # colorspace 0.97 * Moved color palettes from vcd to colorspace, including `vignette("hcl-colors")` * Added infrastructure for HLS color space * New CITATION file