Here are some examples of how your "Start Black" value can change the size and shape of your gamut.

Profile Build Settings

• Photo Glossy Media
• Aqueous Dye based Ink
• 33 Grid Points
• Total Ink Limit = 400%
• Black Generation set to Moderate
• Different views represent use of different Start Black settings
• Semi-transparent sections show comparison to Start Black set to zero

Lower Black Start observations:

• Generally results in larger gamut giving better rendering of darker more saturated colors
• Can result in more color constant grayscale for Achromatic color combinations
• Can cause profile to be less accurate since swatches have lower granularity when black is added
• Can make output appear more grainy
• This is especially true if light cyan and light magenta are used without light black

Note: Converse observations can be made of higher Black Start.

See ICC Build Options for more details.

StartBlack.jpg (image/jpeg)