Doing the Prints
6.3.16 |
| Adobe RGB compared to sRGB colour space |
- Invest in paper (matte paper). (A3 PAPER)
- Do extra research, re-read assessment criteria
- Hue runs through centre of colour space
- Colour space is room that colours exist in.
Blue sky = about 8000k
- If we move to a more vibrant environment the colours have more saturated properties and stay farther away from the middle of the colour space (as compared to a grey, rainy day in England where the colours are more muted and closer to the centre of the colour space).
- The colour space tool goes is not a direct channel. What we do is take something from the real world, put it through glass onto a sensor
- Saturated colours are harder to print than more muted ones.
- This is because 70% of the colour space isn't accessed - much of the shadow detail becomes clipped
- Marit ink, Epsom Paper, Harmon, Hahnemuehle, Lustre - all kinds of papers
iMac can present to us more colours that sRGB can hold. if we do use sRGB we are only using 80% of what our monitor can show us.
Adobe RGB can show us more greens and blues than our monitor can physically show us - This is known as 'out of gamut.'
The 'Gamut' is an old term that refers to a 2 dimensional space (obviously we are in 3d space, but the term still applies).
If this happens and colours are out of gamut, the colours stay the same, but they are rendered as a new, more muted colour that is closer to the grey point of ones colour space.
This is known as 'rendering intent.'
We want to capture reality as accurately as possible. If we take a photo we can gather the gamut of real colour and then ask the values of those colours to be drawn within an rub space giving the colours their own identity. But what happens if we want to print?
MONITOR CALIBRATION
Wont change the colour space but inside the space it will begin to reposition some of the colour values, but this depends on how you view your monitor.
Step 1: Brightness
- When we walk into a room our eyes automatically adjust to the colour temperature of a room.
Step 2: White Balance
- The monitor has a fixed white balance and so we need to fix the monitors white balance to the rooms white balance - Grey cards can be used to adjust the colour space , used in scanning to get the most accurate representation of the colours
Step 3: Calibrating
- System preferences ---> displays ---> colour (monitor on a laptop about 70% of a desktop workspace, unless latest retina screen from Apple)
- Go to Photoshop, right click on the PS space and select 'Medium Grey', (also work at half brightness)
- Photography colour calibration tools are available
- Select 'Show profiles for this monitor only' ---> hit 'Calibrate' ---> Go to ' Target White Point'
- If you choose 'Native White point' you will see no change at all, but if you select one of the others you need some kind of reference (such as a grey card )
- In expert mode, use very small adjustments. Sit far back because peripheral vision will adjust to the white balance around the screen.
Printing
The colour profile for the printer changes with the paper that you use.
All printers are different based on a number of different factors:
- Inks
- Mixture of inks
- Behaviour of the inks on different paper
There are different paper profiles depending on the papers properties. The paper profile sits within the colour space.
Colour Monkey:
Select profile of display ---> Advanced settings ---> Let colour monkey decide optimal luminance
---> Plug that bad boy in ---> Follow on screen instructions for calibration settings ---> turn disc 180 degrees ---> Measure ambient lighting (device will read the colours of the different light sources to create a new white balance) makes the white balance specific to the light and this monitor at this particular time of day ---> Place back into case, place strap over screen to hold it in place and the sensor on the centre of your screen ---> Press 'OK' ---> Screen will calibrate for about 10 minutes and then sort itself out.
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Remove the monkey ---> Name Profile ---> Save ---> Check before and after (brightness level should stay the same ---> Close Program ---> System Preferences ---> Color Sync Utility ---> Computer ---> Displays ---> Observe difference of colour spaces ---> Close
ALSO DEMONSTRATED IN THESE PICTURES:
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| Initial set-up didn't work so we had to download a new driver specific for the OS on the mac. |
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| Connecting the printer to the computer via USB |
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| Calibrating to measure ambient light |
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| Measuring ambient light of room |
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| Calibrating Luminance |
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| Still calibrating - you have to wait about 8 minutes |
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| After about 10 minutes your calibration is done and you should be ready to go |
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GREY CARDS ARE ALSO REALLY GOOD TO INVEST IN.
Because they allow you to
How to Print - Moving Colour Spaces to Paper:
Perceptual:
- Changes all the colours in the image equally so that they fit within the paper Gamut
Relative Colorimetric:
- Changes out of gamut colours to the nearest colour in the printer/paper profile gamut. Does not change in-gamut colours
There are a number of factors that affect the quality of your print. We want the print to match exactly what we see on screen and therefore we must take certain steps to make sure that this happens.
- One of the factors that affect the quality of the print is the screen calibration. I went through this earlier in the post so see above. There are two ways to calibrate your monitor. One is rather lengthy and difficult but available to anyone whereas the second technique requires a ColourMonkey which costs £500 (get out of here) but is incredibly thorough. Calibrating manually consists of doing the following (these are the instructions for Mac).
- Clean your monitor with tissue and the proper spray.
- Turn your brightness to halfway so that you don't make any incorrect adjustments.
- Go to Photoshop, right click on the PS space and select 'Medium Grey'
- Photography colour calibration tools are available (Colour Monkey)
- Get your £60 grey card to compare the colour to make finite adjustments to the greys.
- System preferences ---> displays ---> colour (monitor on a laptop about 70% of a desktop workspace, unless latest retina screen from Apple)
- Select 'Show profiles for this monitor only' ---> hit 'Calibrate' ---> Go to ' Target White Point'
- If you choose 'Native White point' you will see no change at all, but if you select one of the others you will need to use your grey card. Select native white point as it is the most neutral calibration setting
- In expert mode, use very small adjustments. Sit far back because your peripheral vision will adjust to the white balance of the room. Once your eyes have adjusted try and match the Apple logo so that it blends in with the background
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| Relative Colometric test print |
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