Talk:LRGB

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The link is dead. Cu Fred

Improving this stub

This article needs more sources (currently there is only one). Also, the second paragraph does not have a source attributed to a value statement (black and white photos are cheaper and easier).--JCJutson (talk)

Agreed. Monochrome cameras are generally more expensive... ten add in the cost of filters and filter wheel and LRGB imaging is significantly more expensive than one-shot colour (as with a DSLR or other colour imaging camera) the usual approach is to use one camera with four filters. There is much debate as to whether LRGB imaging is faster tahn one-shot colour, as although it is more involved, it collects more data in a given time, all other things being equal. Red, green and blue images are usually 'binned' so a group of (typically) four pixels are grouped to form one 'super-pixel'. This give a lower signal to noise ratio allowing the colour data to be acquired fairly quickly. The luminance data is collected at full resolution (usually with an infra-red and ultraviolet cut filter), because it is broad spectrum roughly three times as many photos are collected per unit of exposure time compared to the colour filtered images, this improves the signal to noise ratio and compensates for a lack of binning. The four layers are combined so RGB provide all the colour data with the luminance layer alone providing the luminosity of the image with higher spatial resolution. Other variations include HaRGB, where narrowband Hydrogen Alpha light that is characteristic of emission nebulae is used for luminosity, exaggerating nebulae and reducing broadband light sources (stars). Other mixes such as HaLRGB (for more aesthetically 'realistic' colours) and adding in other narrowband filter data can be used. Stub Mandrel (talk) 22:26, 29 August 2018 (UTC)

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