Advanced Printing Workshop (Screen)

Over the course of the second semester, Stage 3, Photography, DIT) attended a first advanced printing workshop with Ed Dunne from Inspiration Prints. Discussion in monitor, or #screen, use began with a brief description of what colour constancy is and the difference between D50 (average daylight colour and D65 (midday daylight colour) and an acceptance that, while D65 was the more accurate and appropriate lighting and monitor calibration option, this was not always financially or technologically viable, so many photography labs are kitted out with D50 lights and monitors.

The calibrating of monitors and screens was given great importance. Colour temperature of monitor screens should be 6500K (close to D65). Gamma requires a value of 2.2 while Luminance should be 100 cd/m2 for desktop screens and 90 cd/m2 for laptop screens. The different values for cd/m2 here is due to power differences between types of computers. Recalibrating is recommended quarterly with monthly checks being better.

The class went over colour spaces and colour profiles. A colour space is an abstract mathematical model which simply describes the range of colours. A color space is a method to understand the color capabilities of a particular digital device or file. Ed discussed in detail different colour spaces, starting with sRGB. This was created by HP and Microsoft in 1996 and is generally the colour space used on the internet and in consumer cameras. It is the smallest colour space. The second is Adobe RGB (8bit files), this was created in 1998 and has a broader array of colours than sRGB. Adobe RGB is used in high end printers and monitors. However, the last, ProPhoto RGB is the largest and was created by Kodak in 1998. (16bit files) This is the largest colour space to date which represents 80% of all human vision which is quite incredible.

Finally, the ‘myth’ of screen resolution of 72ppi was discussed. 72ppi related only to the first mac screens in use. Screens are sized in various ppi values and it was important to use a ruler on a photoshop file in order to find out the correct value. The value of the screens in the DIT print room for example are 102-103ppi.

Ed then told the class about monitor calibration and highly recommended we do it to our own laptops or home computers, and doing this monthly is recommended.

The target values for your monitor are as follows

  • Colour temperature = 6500°k (D65) (this is how blue/orange the hue on your image is)

  • Gamma = 2.2 (this is essentially shadows)

  • Luminance = 100cd/m² (computer) (this is how bright the image is)

= 90cd/m² (laptop)

Fig 1: Anon (2018) Advanced Printing Workshop Class Environment

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