Bugs: images & colormaps
Table of Contents
Caveats
Bugs
Caveats
Handling of NaN and Inf values
Chips converts NaN pixel values to the minimum data value (and +Inf values to the maximum data value). This may make it difficult to differentiate those values from finite pixel values.
Bugs
Missing minor tick marks for sexagesimal-formatted axes
Some minor ticks may not be rendered when an image is zoomed out and tickformat=%ra or %dec. This only appears to happen when the axis covers a large range (e.g. 10 degrees) and is relatively close to one of the poles.
As an example, there are no minor tick marks South of -60 in
![[The Y axis covers more than 10 degrees, but there are no minor tick marks South of -60]](imgs/images.13265.png)
which was created with the following code
chips> add_image('broad_flux.img', ['depth', 50, 'threshold', [0, 1e-6]])
chips> set_xaxis(['tickformat', '%ra'])
chips> set_yaxis(['tickformat', '%dec'])
chips> set_axis('all', ['tickstyle', 'outside'])
chips> zoom(0.9)
chips> set_plot_aspect_ratio('fit')
Gamma correction is ignored in SAO color maps.
True color images cannot be added when using only a single red component.
This will default to being a pseudo-color image.
True color images cannot be thresholded or inverted.
Bugs fixed in CIAO 4.5
The following is a list of bugs that were fixed in the CIAO 4.5 software release.
1-D arrays are not supported
add_image will print an error:
chips-60> add_image("one-d.img")
chips ERROR: The length of the data values (143) does not match the
specified dimensions (143 x 143)
chips-61> !dmlist one-d.img blocks
----------------------------------------------------------------------
Dataset: one-d.img
----------------------------------------------------------------------
Block Name Type Dimensions
----------------------------------------------------------------------
Block 1: diff.rest.txt_IMAGE Image Int2(143)
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