Codec.Picture.Jpg

Try to decompress and decode a jpeg file. The colorspace is still YCbCr if you want to perform computation on the luma part. You can convert it to RGB using convertImage from the ColorSpaceConvertible typeclass.

This function can output the following images:

• ImageY8

• ImageYA8

• ImageRGB8

• ImageCMYK8

• ImageYCbCr8

Equivalent to decodeJpeg but also extracts metadatas.

Extract the following metadatas from the JFIF block:

• DpiX

• DpiY

Exif metadata are also extracted if present.

Function to call to encode an image to jpeg. The quality factor should be between 0 and 100 (100 being the best quality).

Equivalent to encodeJpegAtQuality, but will store the following metadatas in the file using a JFIF block:

• DpiX

• DpiY

Equivalent to encodeJpegAtQuality, but will store the following metadatas in the file using a JFIF block:

• DpiX

• DpiY

This function also allow to create JPEG files with the following color space:

• Y (Pixel8) for greyscale.

• RGB (PixelRGB8) with no color downsampling on any plane

• CMYK (PixelCMYK8) with no color downsampling on any plane

Encode an image in jpeg at a reasonnable quality level. If you want better quality or reduced file size, you should use encodeJpegAtQuality

Helper type class describing all JPG-encodable pixel types