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5 creative works found

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• Monitor Calibration and ICC printing profiles.
  by David Iori

  I regularly calibrate my equipment. A Few links to help you understand all about Monitor Calibration and ICC Profiles in the *New Age…

  I regularly calibrate my equipment. A Few links to help you understand all about Monitor Calibration and ICC Profiles in the New Age of Digital Printing. Everything you ever wanted to know about ICC printing Everything you ever wanted to know about Monitor Calibration This Site has everything you ever wanted to know, as Digital Processing is a very complex subject. Gone are the days you drop your negatives into the Labs and they do all the work for you. It would be nice if REDBUBBLE could make the ICC profiles available of the printers they use so we can proof our work against their printers. If you go and read my other Journals I have more on this topic. I like to try to help people, and share my knowledge. David

• T-shirt printing colours
  by David Burren

  If you don’t care too much about colour management, feel free to ignore this. / The current RB T-shirt printing uses 4 inks, and relies on…

  If you don’t care too much about colour management, feel free to ignore this. / The current RB T-shirt printing uses 4 inks, and relies on the underlying white cloth to provide a white. The range (gamut) of colours that can be reproduced on a T-shirt with this printer is much smaller than that reproduced on the other RB printed products. How much smaller you ask? If you have a calibrated monitor and use software such as Photoshop which uses ICC colour profiles, here is the answer! / I’ll demonstrate with a few images from my RB portfolio. For each image I’ll show 3 versions: the original (well, in sRGB), as the T-shirt printing would produce it without correction, and lastly as the T-shirt printing will produce it with the corrections I describe further below. / Dolphin Pair / Breakaways at dusk / Snowgum patterns You’ll see that by default purples don’t come out very well! / The 3rd of each of those images is the “corrected” one: the colours are a little faded compared to the original, but not badly. To achieve the corrections, I have generated an ICC colour profile for the current RB printing process. You can download it in a zip file then extract the file RB_whiteT_070615.icc and install it onto your system. Simply copy it into the appropriate directory: WinXP: WINDOWS\SYSTEM32\SPOOL\DRIVERS\COLOR / OS X: ~/Library/ColorSync/Profiles/ or /Library/ColorSync/Profiles/ Photoshop and other profile-aware software on your system will then be able to access the new profile “RB_whiteT_June07” (you may need to restart the software to pick up the new profile). Photoshop workflow: / How you use it is up to you, but my suggestion is to continue to work on your graphics in your favourite profile (e.g. sRGB, Adobe RGB) but before saving the PNG file to upload to RedBubble, make sure you use Convert to Profile… to convert the image into this RB_whiteT_June07 profile. I recommend you use the Perceptual rendering intent. Photoshop won’t attach the RB_whiteT_June07 profile to the PNG file which you upload to RedBubble, but the Convert to Profile step will have changed the pixel values to get the colour approximately correct. NOTE: this profile was measured from a white T-shirt freshly printed by RedBubble in mid-June 2007. It provides us with a starting point for understanding the colour behaviour of the current T-shirt printing service. If/when RedBubble change their T-shirt printing this profile will no longer be valid. Of course the T-shirt printing will fade over time. I may generate additional profiles as this happens, but we’ll see how useful that ends up being. Also note that the T-shirt previews shown on RB will be a bit weird although the T-shirt colour will come out correctly. Using the above 3 examples, the previews on RB would look like: / Hopefully when RB introduces the new T-shirt printing service (which will apparently have its own white ink for consistent colour across all cloths) they will do something to handle these colour conversions automatically behind the scenes as they do for normal prints. Given the above variables, no guarantees are provided that this profile is 100% accurate. But if you’re willing to give this a try with one of your own T-shirt designs, please let me know how you go!

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  Colour by Numbers
  by David Burren

  US$20.55

  An off-beat design that probably won’t seem out of place amongst colour-geek photographers… Incidentally, the T-shirt can be measured in order to generate an ICC colour profile for T-shirt printing (the colour behaviour will be different on various cloths and as they fade).

• T-shirt printing colours: grey shirts
  by David Burren

  As I described in an earlier journal entry the colours produced by RB’s T-shirt pr…

  As I described in an earlier journal entry the colours produced by RB’s T-shirt printing on white shirts is quite different from the sRGB colours we see on our screens. I’ve since measured the colour behaviour when printing on grey shirts, and it’s dramatic. To illustrate this a bit more, I’ll return to the white T-shirt case. Mapping the range of colours that can be reproduced in the “Lab” coordinate system we get shapes like this: / The wireframe is sRGB, while the solid shape is the white T-shirts. It’s easier to see the precise differences when this 3D model is rotated: this is just a snapshot. The ‘L’ axis represents lightness, with black at the bottom and white at the top. The ‘a’ and ‘b’ axes map out the range of colours. / As you can see, the response in the purples is very weak. Now to compare the white and grey T-shirts from the same point of view: / This time the wireframe is the white T-shirt while the solid shape represents the colours of the grey shirts. Let’s look at it from the other side: / Not surprisingly, the grey shirts are much darker. At the same time the colours are significantly less saturated (closer to the ‘L’ axis). Compare the tiny space of the grey T-shirt colours to the relatively massive sRGB space in the first image! The colours currently reproduced on grey T-shirts are very subdued. / I advise that photo printing on non-white T-shirts be avoided at the moment. / The colours reproduced on coloured shirts are just going to be weird (although I haven’t measured them). “Line-art” can obviously be more appropriate, but even then you should be conscious of how the colours in your design will be affected! Cheers

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  VANILLA ICCE
  by SANCHEZISDEAD

  US$23.94

  Tee Design by Sanchez