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23 Cards in this Set
- Front
- Back
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True or False -
JPEGs are always 8 bit images |
TRUE
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How many colours can a JPEG reproduce?
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16,777,216 colours
(RxGxB or 256x256x256) |
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True or False -
RAW images can reproduce 281 trillion colours |
TRUE
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Dynamic Range of:
Tranparencies is... |
3.0
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Dynamic Range of:
Photopaper is... |
2.8
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Dynamic Range of:
Coated Offset is... |
2.0
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Dynamic Range of:
Newsprint is... |
1.8
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What is UCR?
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Under Colour Removal
- Removes CMY from neutrals and replaces them with K |
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What is GCR?
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Grey Component Replacement
- Removes the grey component from Colours and replaces with K |
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When converting from RGB to CMYK digitally, what 5 main factors must be taken into account?
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1. Dot Gain
2. Ink Limits 3. UCR 4. GCR 5. Grey Balance |
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True or False -
When we convert to CMYK, the colour space is NOT reduced |
FALSE
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What is LUT? and what is it for?
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Look Up Table
- used to convert RGB to CMYK in Photoshop |
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Explain Dot Gain in Photoshop...
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- Specifies the dot gain for press and/or stock
- Can either be set to mid tone or be fine tuned with the use of curves |
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Name some GCR Advantages
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- Faster make-ready
- Reduced ink costs - Better wet ink trapping - Easier to control colour consistency |
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Name some GCR Disadvantages
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- Not widely accepted by press people
- Black becomes a major component of colour - Below 50%, the effect is similar to UCR - Above 50%, extends into colours - 100%, can cause subtle colour variations to be lost |
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Explain Black Generation
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- Used only with GCR
- Determines point at which GCR begins based on relative gray values |
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Explain Black Limit
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- Determines darkest possible value of black produced by Photoshop
- Affects the SH - Leave at 100% unless total ink limit is set above 300% |
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Explain UCA Amount
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- Under Colour Addition
- Adds Cyan, Magenta, & Yellow where black is present in a photo - Generally not desirable in offset printing |
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Explain Total Ink Limit
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- Defines maximum CMYK ink build up
- Photoshop default is 300% |
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What is the Total Ink Limit of
Sheetfed Coated? |
290%-340%
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What is the Total Ink Limit of
Sheetfed Uncoated/Web Offset? |
270%-300%
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What is the Total Ink Limit of
Newsprint? |
250%-280%
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True of False -
The alternative way to conver to CMYK in Photoshop is by using an ICC Profile. |
TRUE
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