About the Encoder property The Encoder property contains the indications about the quality compromise to accept when encoding image to final format. This object allows specifying two properties: a quality measure and a lower threshold for the quality measure. Admisible values for quality measure are: - `default`: Let's our platform select a default measure - `ssim`: Structural Similarity Index. - `fsim-c`: Phase congruency image similarity measure. - `asymmetric-fsym-c`: A modification of fsim-c that gives less weight to compression artifacts in uniform-color backgrounds. - `perceptual-sc`: A simple neural-network approach that tries to mimic the human capability to notice image compression artifacts. Admisible values for the quality measure is a number between 0.25 and 1.00. The The encoder will try to produce the smallest image whose quality (as defined by the quality measure) is above this quality threshold.