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Sequences are for when you've rendered a shot or perhaps a wedge of parameters to a shader and now you would like to see them all played as a sequence. The Sequence toobar has the controls for starting and stopping playback and the frame range controls. "it" will either play the whole catelog or you can open a set of images on disks as one element (called a "sequence"). There is also a "scrub" mouse tool which when activated lets you move through a sequence by dragging with the left mouse button in a horizontal direction.
An image sequence can be created by opening multiple files on disk in a directory, use File->Open Sequence instead of File->Open Image. "it" will discern which files belong to the sequence; and the frame range will appear in the Sequence toolbar.
Sequences are low tech in that they don't provide a way to save or load movies, and the entire "movie" is held in RAM. "it" places a cap on the number of images it will hold in RAM so for smooth playback you will need to set that cap (Image Cache Size) to at least the number of frames in your sequence.
Color chart generator
The photo and film industry has been using color rendition chart for decades ensure high quality results. You can read about it here.
It offers a standard color chart generator using published sRGB values. You can use it in your look-dev renders as an absolute color reference. The color chart is generated at 1024x768 and should be saved as a 8-bits image (tiff, png) with "burn mapping" enabled.
Analysis Tools