Incense

by Bart Arondson

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3

Darktable can remove chromatic aberrations if you are shooting raw. Your example image is a JPEG so I can't demonstrate how it works with that, but above is a screenshot of it removing the chromatic aberrations from a photo of a table lamp. In Darktable this is done with the 'Chromatic aberrations' module available in the right pane, part of the ...


3

Actually it's very simple. If you open the Histogram tab, there are some basic statistics about the color values, such as mean, standard deviation and median. Depending on the selected tab (RGB, Red, Green, Blue, Value) you'll get different statistics. If you want to know the average color, take the Mean from the three separate channel histograms and ...


3

About the colors - It doesn't really matter, it all depends on your color to black and white conversion. I guess green or blue cloths will be easiest to manipulate (see below) because those colors have their own slider and they don't appear in skin tones. About the patterns - I don't know. Your camera's sensor only records color images, conversion to ...


2

Almost never. At least for photographs (graphic designers and illustrators might find great utility in the "create texture" option). The only reason, really, would be when (a) repeated attempts using the content aware option failed to produce anything other than a mess, (b) no appropriate sampling point is available for the healing brush (proper), the clone ...


2

You can use Lensfun. Lensfun is a free/open-source (LGPL) library for fixing a number of defects from lenses. Check the list of supported lenses here: Lensfun coverage. See the "TCA" column, they are the lenses where data is available for correcting chromatic aberration. Note this is currently only a small number of lenses. If your lens is not supported, ...


2

Rawtherapee can do it to processed images. For some reason, "Defringe" is located on the detail tab, and you can specify what colors you want to take care of.


1

There is nothing wrong with that picture. :-) Gives back the feeling and the artistic intention. Anyway, potential improvements can be achieved by using a camera with high dynamic range sensor and using a strong dynamics compression curve (any new cameras know this, just do some test shots...) and/or zoom on the face, use center-weighted exposure ...


1

Since most of all images are shown either in RGB or CMYK mode, calculating an average color value from there is difficult because you have 3 or 4 values per pixel. I would try to convert the image into HSV mode (Hue, Saturation, Value). There you have one specific color value for each pixel which is easier to calculate. See also here: Wikipedia Link HSL and ...



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