The CHANNELTYPE enumeration provides information about the type of the channel used to identify the alpha channels (extra channels) in the PSD files.
typedef enum _CHANNELTYPE{ALPHA_CHANNEL = 0,RED_CHANNEL,GREEN_CHANNEL,BLUE_CHANNEL,CYAN_CHANNEL,MAGENTA_CHANNEL,YELLOW_CHANNEL,KEY_CHANNEL,GRAY_CHANNEL,BITMAP_CHANNEL,LIGHTNESS_CHANNEL,A_CHANNEL,B_CHANNEL} CHANNELTYPE;
Alpha channel.
Red channel.
Green channel.
Blue channel.
Cyan channel.
Magenta channel.
Yellow channel.
Key channel.
Gray channel.
Bitmap channel.
Lightness channel.
A channel.
B channel.
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