Top > JPEG > APP14

JPEG/APP > JPEG/APP14

  • https://www.itu.int/rec/T-REC-T.872-201206-I

    Transform flag values of 0, 1 and 2 shall be supported and are interpreted as follows:

    0 – CMYK for images that are encoded with four components in which all four CMYK values are complemented; RGB for images that are encoded with three components; i.e., the APP14 marker does not specify a transform applied to the image data.

    1 – An image encoded with three components using YCbCr colour encoding.

    2 – An image encoded with four components using YCCK colour encoding.

APP14

Transformフラグが2の場合、YCCKとして画像を変換
Transformフラグが1の場合、YCbCrとして画像を変換
Transformフラグが0の場合、特定されませんが、SOFのコンポーネントが3つの場合RGB、4つの場合CMYKと仮定して変換するようです。

カラースペース


Reload   Diff   Front page List of pages Search Recent changes Backup Referer   Help   RSS of recent changes
Last-modified: Thu, 16 Jan 2020 13:30:14 JST (169d)