# pavo 2.4.0

## NEW FEATURES AND SIGNIFICANT CHANGES

* Fixed a bug introduced in version 2.3.0 that gave wrong values for S1UV and 
S1V in `summary.rspec()`.
* several `plot()` functions for colspace (`triplot()`, `tcsplot()`, 
`tetraplot()`) gain a new `gamut` argument to plot the maximum gamut for a given
visual system and illuminant. `summary.colspace()` also now returns the maximum
colour volume for a given visual system and illuminant that you can use to
compare to the realised volume by a given dataset. More information in PR #180.
* parallel processing now relies on the `future` package, which offers windows 
and high performance computing (HPC) environments support. The progress bar is
produced by the `progressr` package and can be customised as well. As a 
consequence, the `cores` argument in `getspec()`, `adjacent()` and `classify()`
has been deprecated.

## MINOR FEATURES AND BUG FIXES

* fixed a plotting bug introduced in version 2.3.0 where it was required to run
`projplot()` twice for the background grid to be displayed.
* fixed a bug in `summary.colspace()` where `NULL` was returned instead of 
`summary.data.frame()` for non-tcs colourspaces.
* fix partial matching warnings in examples and in `bootcooldist()`
* the package has a new website at `pavo.colrverse.com`
* fixed a bug in `coldist()`that prevented the calculation of achromatic contrast
when using custom quantum catch data 

# pavo 2.3.0

## NEW FEATURES AND SIGNIFICANT CHANGES

* `plot.rspec()` now adds a linear spectrum alongside the x-axis to show the 
hues corresponding to each wavelength (controlled by the `wl.guide` boolean 
argument).
* `cieplot()` (and therefore `plot.colspace()` for CIEXYZ model) now adds the 
background of the CIEXYZ colour space by default. This can be turned off by
switching the `ciebg` argument to `FALSE`.
* `voloverlap()` uses a different algorithm to determine volume overlaps, which 
means:
  - computation is now much more efficient
  - `voloverlap()` now works for `trispace()` objects as well
  - accordingly, first two arguments of `voloverlap()` has been renamed `colsp1`
  and `colsp2` instead of `tcsres1` and `tcsres2`
  - slow and possibly inaccurate `montecarlo` option has been deprecated

## MINOR FEATURES AND BUG FIXES

* errors during argument checks in `vismodel()` now have more explicit messages.
* all `pavo` functions (excepted `vismodel()` and `spec2rgb()`) now work with
sub-nm precision, for `rspec` objects with non-integer wavelengths.
* `summary.colspace()` no longer fails for tcs objects with only one row.
* `vismodel()` now works for monochromats as well.
* `procspec(opt = "bin")` no longer counts bin edges twice (once in each consecutive bin). This will cause changes in the bin stops compared to earlier versions of this function.
* `coc()` and `categorical()` spaces now return Weber luminance contrast by default when passed through `coldist()`, rather than nothing (as per the original publications). 
* `coldist()` can now take multiple values for `weber`, when Weber fractions are known for all receptor classes
* `summary.rspec()` no longer errors for a single spectrum when the wavelength range does not contain 450-700nm

# pavo 2.2.0

## NEW FEATURES AND SIGNIFICANT CHANGES

* added k-medoids clustering as an option in `classify()`
* `coldist()` now returns unweighted Euclidean distances for generic di-, tri-, and tetra-chromatic `colspace()` models. Users wishing to estimate noise-weighted distances (i.e. via the receptor-noise limited model) should continue to use `coldist()` directly on `vismodel()` objects, as previously.

## MINOR FEATURES AND BUG FIXES

* added a message to indicate what distance metric is being calculated during calls to `coldist()` 
* `vismodel()`, `colspace()`, and `coldist()` now always return `lum` and `dL` columns, for consistency
* `irrad2flux()` and `flux2irrad()` use slightly more precise constant values, which may lead to slightly different results (less than 0.1% difference between this new version and the previous versions)
* `getimg()` can now import images from URL's
* the `cores` argument in `getimg()` is deprecated, as image import is vectorised
* fixed a small bug in `classify()` when using `refID` and `kcols` for multiple images
* the `resize` argument in `procimg()` now takes a percentage, rather than scaling factor
* fixed a bug where `colspace(space = segment)` would return both a `B` and (redundant) `lum` column
* fixed a bug where the rod sensitivity of _Canis familiaris_ was inaccessible through `vismodel()`
* fixed an issue in `getspec()` where badly encoded characters in some spectral files would cause failure
* fixed a bug where `coldist()` would attempt to estimate receptor-noise weighted distances rather than cie-distances for `cielch` model results

# pavo 2.1.0

## NEW FEATURES AND POTENTIALLY BREAKING CHANGES

* added the argument `reclass` to `procimg()`, which allows users to interactively
correct areas within images that have been misclassified
* added the rod sensitivity of _Canis familiaris_
* `peakshape()` uses a completely different algorithm to find the FWHM. It now
works as expected for spectra with multiple peaks. See [PR #137](https://github.com/rmaia/pavo/pull/137) for a detailed 
overview of the changes.
* data used internally by pavo (`bgandilum`, `transmissiondata`, `ttvertex`, `vissyst`) is no longer exposed to users

## MINOR FEATURES AND BUG FIXES

* new functions `is.vismodel()` and `is.colspace()` are exported to test whether an object is of class `vismodel` or `colspace`, respectively
* fixed a bug where images would sometimes be wrongly detected as user-classified in `as.rimg()`
* the UV-sensitive cone is now only always named "u", even for VS species (such as `pfowl` and `avg.v` in `vismodel()` and `sensdata()`). This removes an unnecessary but harmless warning when `colspace()` was used to place quantum catches of such species in the tetrahedral colour space.
* the `achro` argument in `coldist()` has been changed for `achromatic` to
better match the arguments from `vismodel()`. Older scripts that use `achro` 
should not be affected and still work as before.
* the package `imager` is no longer a dependency, and is only loaded if using some 
features of `procimg()`.
* the package `mapproj` is no longer a dependency, and is only loaded if using 
`projplot()`.
* added the argument `labels.stack` to `plot.rspec`, which allows the use of 
custom spectra labels in stacked plots.
* users now receive a warning when interpolating beyond the limits of the data using `as.rspec`, and can control the behaviour with the new argument `exceed.limits`. 
* all deprecated functions and arguments have now been fully removed.
* `as.rspec()` now accepts both numeric and character vectors to identify the wavelength column using `whichwl` (eg. `whichwl = "wl"`).  
* Reference images in `classify()` can now be specified using either a numeric vector (to identify by image position in a list) or character vector (to identify by image name).  
* fixed a bug in `aggspec()` when wavelength column was previously removed by the user.
* fixed a bug where `cocplot()` would failed whenever `type` graphical parameter was specified.
* `spec2rgb()` has been simplified to rely more on `vismodel()`. As a result, output values may be slightly different but upon testing, we found that differences between the old and the new version were barely noticeable.
* the vignette have been split into three smaller parts, which should help new users to get started with pavo
* numerous under-the-hood changes for stability and speed, with thanks to 
three reviewers and an associate editor at MEE.

# pavo 2.0.0

## NEW FEATURES

* image-based workflow for the combined analysis of colour and pattern geometry
* added the visual systems of the (trichromatic) jumping spider _Habronattus pyrrithrix_
and the (trichromatic) triggerfish _Rhinecanthus aculeatus_
* `getspec()` can now read Avantes binary files (`.TRM` files)

## MINOR FEATURES AND BUG FIXES

* Carotenoid chroma (S9) in `summary.rspec()` has been fixed to (R700 - R450)/R700.
This gives the same result as before but with a flipped sign, and better reflects
the original formula in the literature.
* cieLAB values have been rescaled, and are expressed in the more standard range:
L [0,100], ab [-128,127]
* `getspec()` has an additional argument `ignore.case` set to `TRUE` by default
to ignore case in file extension matching
* fix a bug where `getspec()` would sometimes fail with files including numbers in
scientific format
* add a new option in `tetraplot()` to add cone names (u,s,m,l)

# pavo 1.4.0

## NEW FEATURES

* `getspec()` can now read OceanOptics `.ProcSpec` files
* added the visual system of _Ctenophorus ornatus_, the (trichromatic) ornate dragon lizard

## MAJOR CHANGES

* `getspecf()` (and the argument `fast = TRUE` in `getspec()`) have been deprecated
* `summary.rspec()` returned incorrect values for S7. If you use S7, please re-run
your analyses

## MINOR FEATURES AND BUG FIXES

* `summary.rspec()` now properly outputs `NA` for monotonically decreasing spectra
* fixed warning when `subset.rspec()` was provided with a logical vector
* fixed harmless warning when `summary.colspace()` was used on a tcs object
* `by` argument in `merge.rspec()` is no longer ignored
* fixed bug in `voloverlap()` when plot = TRUE
* fixed bug in `vismodel()` when transmission has more than one column
* fixed bug in `vismodel()` that applied von Kries correction to achromatic channel
* added argument `fill=FALSE` in `voloverlap()`
* fixed bug in `jndplot()` when suppressing the plotting of arrows
* better handling of subset data when using summary.colspace() and summary.vismodel()
* fixed bug in `coldist()` when `noise = "quantum"` and `achro = TRUE` were used
* fixed bug in `jndplot()` when `arrow = "none"` and `achro = TRUE`
* `spec2rgb()` now takes into account the 390-400 nm wavelength range into
account when possible
* `as.rspec()` no longer fails with tibbles
* bin option of `procspec()` now works for all values of bins
* non-relative quantum catches from dataframe object were not correctly scaled
in "di", "tri", "categorical" and "coc" colorspaces
* fixed a bug in `colspace()` where it would incorrectly infer a preference for
a general trichromatic space, when a cie model is more appropriate
* fixed a bug so that cie color matching functions can be more easily be used in
a general trichromatic space (i.e. maxwell triangle)

# pavo 1.3.1

## NEW FUNCTIONS

* `bootcoldist()` uses bootstrap to calculate the confidence intervals on
the mean color distance between samples

## MINOR FEATURES AND BUG FIXES

* fixed bug in `coldist()` when fewer samples than the number of photoreceptors
* fixed bug in `getspec()` that would cause it to crash with errors
* fixed bug in `tetraplot()` when saving images

# pavo 1.3.0

## NEW FUNCTIONS

* jnd2xyz() converts distances (in JND, resulting from a coldist() call) into cartesian coordinates
* plot() methods for objects resulting from jnd2xyz()
* jndrot() produces rotations of Cartesian coordinates resulting from jnd2xyz()
* coldist2mat() converts coldist() result from a pairwise data.frame to a distance matrix
* sensdata() function for retrieving and/or visualising pavo's in-build spectral data

## MAJOR CHANGES

* tetraplot() and cieplot() have been completely rewritten to allow finer viewing control
* tetraplot() allows forced perspective using size to denote distance
* voloverlap() and vol() have also been changed to work with the new tetraplot() options
* getspec() has been rewritten to be faster, more general, and allow parallel processing
* subset functions now allow more than one argument to be used, and allow further attributes to be passed onto grep (e.g. invert = TRUE)

## MINOR FEATURES AND BUG FIXES

* fixed bug in coldist() on log-transformation when object was neither of class vismodel nor colspace
* fixed bug in dL calculation when input is a colspace object
* fixed bug in vismodel() when a data frame, matrix or rspec object was passed as the background
* fixed bug in colspace() models when using non-standard receptor names or ordering
* fixed bug in hexagon() model when calculating location & metrics for achromatic stimuli
* fixed location of red vertex in tetraplot()
* fixed bug in the argument names for expanding text labels in colspace plots
* removed na.rm argument from aggspec() that was causing a bug when the error function did not have that argument. User should pass it as an argument to the function if necessary.
* changed default to achro=FALSE in coldist()
* replaced the modelled receptor sensitivities of the honeybee _Apis mellifera_ with the empirical sensitivities from Peitsch et al (1992)
* the built-in 'green' background spectrum is no longer normalized
* removed wavelength limitations in the calculation of H3 from summary.rspec
* all visual systems (except CIE) have been normalized to have an integral of 1

# pavo 1.2.0

## MAJOR CHANGES

* added the CIELch model accessed via colspace(space = 'cielch')
* added the sensdata() function for retrieving and/or visualising pavo's in-build spectral data

## MINOR FEATURES AND BUG FIXES

* vignettes have been amalgamated & the single, main vignette is now up-to-date
* added more informative labels for the segment analysis plot

# pavo 1.1.0

## NEW FUNCTIONS

* segspace() replaces the deprecated segclass(), and is accessed via the colspace() argument space = 'segment'. The results of segspace()
are also now compatible with coldist() for the estimation of Euclidean colour-distances.
* segplot() is a plot for Endler's (1990) segment analysis, and is accessed — along with all other 2d plots — via plot.colspace()

## MINOR FEATURES AND BUG FIXES

* the use of relative quantum catches is now optional in the categorical colorspace (though still produces a warning), for greater flexibility
* updated several functions to work when rspec object has only one spectrum
* fixed bug in voloverlap where interactive plots would result in error
* fixed incorrect labels in the maxwell triangle plot
* fixed a bug in as.rspec() in which lim was not applied when interpolate = FALSE
* fixed bug in aggplot() which resulted in error when using lty, lwd arguments
* warning if ocular media is being used in both vismodel() and sensmodel()
* added an 'all' option to the achromatic argument in vismodel()
* added the ability to calculate dL for cielab models in coldist()
* added some more informative messages and warnings

# pavo 1.0

* See vignette for detailed description of changes.

## MAJOR CHANGES

* coldist() arguments have been changed. Now the empirically estimated value for the Weber fraction must be entered, instead of the noise-to-signal ratio. The noise-to-signal ratio is then calculated based on the empirically estimated Weber fraction for the reference cone type, and applied to the remaining cone types. This should avoid confusion between empirically estimated values for the Weber fraction and the noise-to-signal ratio, which are currently prevalent in the literature.
* coldist() now has an additional argument, weber.achro, so that the value for the Weber fraction to be used to calculate achromatic contrast can be input independently of the cone ratios.
* tcs() is deprecated, replaced by colspace().

## NEW FUNCTIONS

* colspace() replaces tcs() and introduces several new colorspaces
* plot() methods for several colspace() outputs, including a static tetrahedral colorspace
* projpoints() allows the plotting of points in a projplot() figure
* vol() draws volume polygons in static tetrahedral plots
* axistetra() draws reference x, y and z axis arrows in static tetrahedral plots
* legendtetra() adds legends to static tetrahedral plots

## MINOR FEATURES AND BUG FIXES

* summary.colspace() for tcs spaces now returns relative color volume as well as absolute
* tcsvol() and voloverlap() now allow control for line width
* procspec() fixed error when attempting to smooth rspec object without column names
* procspec() handles smoothing before fixing negatives to avoid re-adding negatives when smoothing
* procspec(), aggplot() accept additional arguments to summary functions (e.g., na.rm=TRUE)
* peakshape() default wavelength limits (lim) now taken from rspec object rather than 300-700
* peakshape() returns warning if a spectrum contains duplicate reflectance values
* summary.rspec() works with single spectra
* aggplot() and aggspec() fixed bug on ordering of levels when they don't match the sequence in the rspec object
* aggplot() added logical argument "legend" for automatically adding a legend to the plot
* vismodel() returns error if bkg=NULL
* getspec() patched to stop returning warnings in Yosemite
* getspec() has a faster (~5-10X), but less flexible, algorithm used when all input files are from the same source.

# pavo 0.5-6

## BUG FIXES

* fixed bug in calculation of dichromat contrast in coldist()

# pavo 0.5-5

## MINOR FEATURES AND BUG FIXES

* fixed bug in calculation of H3 in summary.rspec()

# pavo 0.5-4

## MINOR FEATURES AND BUG FIXES

* changed default values for coldist()

# pavo 0.5-2

## MINOR FEATURES AND BUG FIXES

* fixes to the blue tit visual system, changed vismodel() argument to "bluetit"

# pavo 0.5-1

## MINOR FEATURES AND BUG FIXES

* vismodel() accepts matrix, data.frame or rspec objects for the illuminant, updated warning messages associated with this use
* vismodel() accepts user-defined achromatic receptors
* tcsplot(), tcsvol() & tcspoints(): transparency control passed to user
* getspec() works with OceanView files

# pavo 0.5

* updated citation()

## MINOR FEATURES AND BUG FIXES

* vismodel() vonkries = TRUE does not return a NULL result
* vismodel() works with a single spectrum object
* tcsplot() allows greater control of tetrahedron appearance
* summary.rspec() allows for user-defined minimum wavelength (for calculation of UV variables)

# pavo 0.3-1

## NEW FUNCTIONS

* irrad2flux() and flux2irrad() to convert illuminant measurements

## MINOR FEATURES AND BUG FIXES

* vismodel() less cryptic error messages
* as_rspec() fix message pertaining wavelength column
* getspec() now removes empty columns (generated by bad tabulation)
* plot.rspec() fix color labelling issue (previously, when user specified fewer colors than number of spectra, 'stack' and 'overlay' colored spectra differently)

# pavo 0.3

## NEW FUNCTIONS

* subset() class methods for rspec, vismodel and tcs
* summary() method for vismodel, returns attributes used in visual model

## VISUAL MODEL

* vismodel() output includes only Qi or fi (as selected by qcatch argument)
* vismodel() von Kries correction is now an optional argument
* coldist() subset argument for partial filtering
* Updated sensitivity curves

## MINOR FEATURES

* getspec() works with Avasoft 8 output
* aggspec() if no "by" argument is supplied, applies function to all spectra

## BUG FIXES

* tcs() accepts receptor names other than usml, issues warning
* aggplot() allows control for different line types per spectra
* voloverlap() now assigns darkgrey color for overlap if color vector is of length 1 or 2

# pavo 0.1-2

## NEW FUNCTIONS

* merge.rspec() combines rspec objects in a single object

## VISUAL MODEL

* Changed vismodel() output: von Kries correction is now an optional argument, output includes only Qi and fi
* vismodel() accepts a scale parameter (multiplies illuminant in order to make it in flux units)
* coldist() includes option for receptor noise calculation
* Updated sensitivity curves

## MINOR FEATURES

* sensmodel() accepts user-defined ocular media transmission
* voloverlap() allows greater user control of plotting options
* voloverlap() includes Monte Carlo option for overlap calculation
* as.rspec() accepts "whichwl" argument for user-defined wavelength column selection
* as.rspec() includes "interp" argument; updated automatic search for wavelength column
* aggspec() aggregates spectra by multiple vectors (e.g. average spectra by species and sex using by=list(species,sex) )
* peakshape() gives plot titles, allows ask=TRUE and mfrow

## BUG FIXES

* explorespec() "free" argument fixed
* summary.rspec() S5 variable fixed; segments now divided by B1 (brightness-independent measure of saturation)
* summary.rspec() checks for positive values when bmaxneg is calculated, returns NA
* tcs() accepts "v" cone class
* aggspec() fixed matching of names
* procspec() works with rspec objects that include a single reflectance spectrum
* peakshape() minor fixes
