Colour

Meaning of CMYK and RGB

CMYK is refer to C= Cyan (blue), M= Magenta, Y= yellow and K= black. Blue called as C and blac called as K because the potential of confusion with the words and abbreviations for blue and black, blue is called cyan and abbreviated C, and black is abbreviated K.

RGB is referring to Red, Green, and Blue. It is the colour system for computer monitors, video, etc. without going into the science, it is critical to understand that PMS and CMYK are for printed pieces and RGB is for computer applications such as website.

 

Differentiate the purpose of Channel, Colour Correction saturation and brightness 

Channels:

Channel is the grayscale image of the same size as a colour image, made of just one of these primary colours. For instance, an image from a standard digital camera will have a red, green and blue channel. A grayscale image has just one channel. The grayscale images are store in different types of information which is:

  • Colour information channels are created automatically when open a new image. The image’s colour mode determines the number of colour channels created. For example, an RGB image has a channel for each colour (red, green, and blue) plus a composite channel used for editing the image.
  • Alpha channels store selections as grayscale images. It also can add alpha channels to create and store masks, which is can be manipulate or protect parts of an image.
  • Spot colour channels specify additional plates for printing with spot colour inks

An image can have up to 56 channels. All new channels have the same dimensions and number of pixels as the original image. The file size required for a channel depends on the pixel information in the channel. Certain file formats, including TIFF and Photoshop formats, compress channel information and can save space. The size of an uncompressed file, including alpha channels and layers, appears as the right-most value in the status bar at the bottom of the window when choose Document Sizes from the pop‑up menu.

 

Colour correction:

Colour correction refers to the process where every individual clip of a video footage is altered to match colour temperature of multiple shots to a consistent technical standard of appearance. It’s about balancing out colours, making the whites actually appear white, and the blacks actually appear black, and that everything in between is nice and even. The purpose is to match the video footage to a standard that would be an accurate portrayal of how it would look if viewed from the human eye.

Saturation:

Saturation is the amount of a hue used in defining a specific colour. When a colour is void of any saturation it is black, white, or a variance of grey. A colour that is fully saturated has the maximum amount of hue possible. Partial saturation creates a range of colours, from muted dull tones to rich vibrant colours.

https://www.videomaker.com/article/c3/15710-color-grading-in-post-production

Brightness:

Brightness refers to how much white (or black) is mixed in the colour while Saturation indicates the amount of grey in a colour. The purpose is to adjust the light and dark in images.

 

resources:

http://www.labnol.org/home/hue-saturation-luminosity/20104/

https://www.motionelements.com/blog/articles/understanding-color-correction-vs-color-grading-for-post-production

http://wolfcrow.com/blog/what-is-a-digital-image-channel-and-the-alpha-channel/https://helpx.adobe.com/photoshop/using/channel-basics.html

http://www.visiblelogic.com/blog/2011/05/cmyk-rgb-pms-color-systems-defined/

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