The Filter module allows for the modification of features in the image by their colour by simply clicking on them. It is as close to a post-capture colour filter wheel as you can get.
Filter can be used to bring out detail of a specific colour (such as faint Ha, Hb, OIII or S2 details), remove artefacts (such as halos, chromatic aberration) or isolate specific features. It functions as an interactive colour filter.
The Filter module is the result of the observation that many interesting features and objects in outer space have distinct colours, owing to their chemical make up and associated emission lines. Thanks to the Color Constancy feature in the Color module, colours still tend to correlate well to the original emission lines and features, despite any wideband RGB filtering and compositing. The Filter module was written to capitalise on this observation and allow for intuitive detail enhancement by simply clicking different parts of the image with a specific colour.
A 'Filter Mode' parameter selects the mode of the filter. Available modes are;
The 'Filter Width' parameter specify the responsiveness of neighbouring colors in the spectrum. A small 'Filter Width' will see the module only modify areas with a very precise match in colour to the area selected, while a larger 'Filter Width' will see the module progressively modify areas that deviate in colour from the selected area as well.
The 'Sampling Method' mode selects how a click on the image samples the image. The '3x3 Average' mode samples a 3x3 area around the clicked pixel and uses the resulting 9-pixel average as the input colour. The 'Single Pixel' mode, samples only the precise pixel that was clicked.
Finally, a 'Mask Fuzz' parameter allows for the result to progressively masked in cases where a mask is set.
The Filter module's 'Fringe Killer' mode is an easy and very effective way to remove unsightly blue and purple halos caused by chromatic aberration.
Simply put the offending stars, including their halos in a mask (one can be automatically generated from within the Filter module, by clicking Mask, Auto, Stars or FatStars, Do, Keep). Next click a few times on different parts of the purple or blue halos and they will slowly disappear with each click.
By tracking signal and noise evolution during processing, it lets you effortlessly accomplish hitherto "impossible" feats.
Thanks to StarTools' Tracking feature the Color module provides you with unparalleled flexibility and color fidelity when it comes to colour presentation in your image.
AutoDev, in the presence of any issues, brings out those issues, just like it would with real detail.
If you just loaded an image, all pixels in the whole image will be set in the mask, so every pixel will be processed by default.
This too is common practice in the realm of documentary photography.
You can convert everything you see to a format you find convenient. Give it a try!