Color pipeline#

Stretch greyscale FITS data, tint each layer, and sum channels the classic way. Narrative: Intensity scaling, Color compositing.

Stretch & rescale#

`rescale_image`	Rescale image data to the [0,1] range with the specified stretch function and manual interval.
`zscale_limits`	Compute display limits using the IRAF zscale algorithm (astropy.visualization.ZScaleInterval).
`make_norm`	Create a matplotlib `Normalize` for display or `rescale_image`.
`adjust_gamma`	Replacement function for skimage.exposure.adjust_gamma, so that NaNs don't throw errors
`stretch_functions`	Name → astropy stretch class for unsigned `rescale_image` / `make_norm`.
`SIGNED_STRETCHES`	Built-in immutable sequence.
`STRETCHES`	Built-in mutable sequence.
`nan_percentile_of_score`	Usage is identical to scipy.stats.percentileofscore(array_in,score), this just corrects for NaNs
`draw_progress_bar`	Dependency-free ANSI progress bar written to stdout.

The built-in draw_progress_bar() is a zero-dependency ANSI stdout bar (used by reproject_cube() when print_progress=True). For richer progress in your own loops, use tqdm directly — see the function docstring for a side-by-side example. Multicolorfits does not depend on or wrap tqdm.

Colorize#

`to_grey_rgb`	Stretch a 2D intensity array and expand it to a greyscale RGB cube in [0, 1].
`colorize_image`	Add color of the given hue to an RGB greyscale image.
`colorize_image_direct_rgb`	Tint a greyscale RGB cube by multiplying channels with a solid hex color.
`smooth_image`	Apply isotropic Gaussian smoothing to a 2D or multichannel image.
`hex_to_rgb`	Converts a hexadecimal string to RGB tuple
`rgb_to_hex`	Converts RGB tuple to a hexadecimal string
`hex_to_hsv`	Convert a hexadecimal string to HSV tuple
`hex_complement`	Return the complementary hex color (bitwise inverse on the RGB cube).
`to_hex`	Convert c to a hex color.

Combine (classic RGB)#

`combine_multicolor`	Combines input colorized RGB images [:,:,3] into one intensity-rescaled RGB image
`plot_combined_rgb`	Plot a multicolor RGB image with WCS axes and save it to disk.
`compare_multicolor_vs_rgb`	Side-by-side comparison of a conventional RGB stack and a multicolor composite; saves the figure to disk.
`save_rgb_fits`	Write a multicolor RGB cube to a FITS file with the shared WCS header.