{"id":342,"date":"2013-06-04T14:16:00","date_gmt":"2013-06-04T12:16:00","guid":{"rendered":"https:\/\/www.printwild.co.za\/news\/?p=342"},"modified":"2025-07-07T17:59:13","modified_gmt":"2025-07-07T15:59:13","slug":"the-world-of-colour-correction","status":"publish","type":"post","link":"https:\/\/www.printwild.co.za\/news\/the-world-of-colour-correction\/","title":{"rendered":"The World of Colour Correction \u2013 One of the most intricate and complicated worlds to live in"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">After a rather long sabbatical, PrintWild is back in action and ready to take the blogging world by storm! Paul (Snr) Changuion wrote this article on his experience over the last few weeks with colour correction:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cHaving spent many years correcting and printing colour images, the past two weeks have been really interesting. Colour management is a huge subject and would take volumes to explain fully.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three weeks ago I went for a a simple eye check up with\u00a0<a href=\"http:\/\/www.eyecarey.co.za\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ophthalmologist Dr Malcolm Carey<\/a>\u00a0of Ballito.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The bottom line was that I had lens replacements in both my eyes.\u00a0 After the first implant (in my left eye) I noticed the new lens was about 40% sharper than it was through my year-old prescription specs.\u00a0 More surprising was that my left eye seemed to see about 5% bluer than the untreated eye.\u00a0 After a day or so the colours seen by both eyes were once again in agreement.\u00a0 Another anomaly was that all colours appeared more saturated.\u00a0 Finally this Tuesday the right eye lens was replaced, which produced the same colour cast as the left eye in the first 24 hours and by Wednesday evening my sight was amazingly sharp and comfortable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This fascinating experience prompted me to ask Dr Carey a few questions:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 1:<\/strong>\u00a0 What colour lenses did you put into my eyes?<br \/><strong>Answer:<\/strong>\u00a0 The implant lenses apparently do have a yellowish filter, to protect the retina from mostly invisible blue and ultraviolet rays.<br \/><strong>Question 2:<\/strong>\u00a0 Does the brain compensate for colour cast in light sources? For example,\u00a0 I once spent some time in a green Porta Loo when following the Umzinduzi Canoe Marathon and when I eventually emerged, everything seemed, for a while, to have a magenta colour cast.\u00a0 Another example was driving a car with the top section of the windscreen having a green anti-glare tint.\u00a0 This had the same effect.\u00a0 For a while after that, having left the car, the blue sky had a magenta cast.<br \/><strong>Answer:<\/strong>\u00a0 This was because the brain had in the false light conditions compensated for the colour cast produced by the green.\u00a0 The green sensitive photoreceptors (cones) had increased activity in a green environment and then a degree of photoreceptor \u201cexhaustion\u201d had occurred. This led to an under representation of green once in natural environment. (One should always minimise time in portaloos for obvious reasons!!!)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 3:<\/strong>\u00a0 Is there a method to test an individual\u2019s colour sensitivity?<br \/><strong>Answer:<\/strong>\u00a0 The most sensitive\u00a0 test\u00a0 is called \u201cFarnsworth-Munsell\u201d.\u00a0 It\u2019s time consuming and would be expensive to run, but would give one a clear summary of an individual\u2019s colour perception, or in our terminology, our very own colour profile\/gamut.\u00a0 The results would produce a graph very much like the colour gamut produced when profiling a printing paper.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Question 4:<\/strong>\u00a0 How varied does colour appear to different people?<br \/><strong>Answer:<\/strong>\u00a0 Generally, on average, women are more sensitive to colour variations than men are. (Men are more likely to have a degree of colour blindness which can vary from mild to complete \u2013 this is usually RED- GREEN. Female colour blindness is less common but when present, is usually more severe).\u00a0 Dr Carey did not have any survey statistics available, but said a rough estimate would be that only 30% of people could differentiate finite colour casts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>This begs the question:\u00a0 How do we judge the colour in images when editing them for print and how does this impact colour correction?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The starting point would be to use a good IPS\u00a0 (In-Plane Switching) monitor. Your monitor should be calibrated with a monitor calibrator, i.e. a Spyder Display Calibrator.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As explained in a very informative\u00a0<a href=\"https:\/\/www.slrlounge.com\/what-is-an-ips-monitor-understanding-ips-displays\/\" target=\"_blank\" rel=\"noreferrer noopener\">article<\/a>: \u201cIPS displays were designed to improve on the flaws of LCD technology, primarily in regards to the poor viewing angles and colour reproduction. They do this by simply altering the direction of the pixels within the display (parallel instead of perpendicular pixels). Of course, it really isn\u2019t that simple and neither is explaining it. So let\u2019s just leave it at that ;)\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below an IPS display remains stable when viewing from an angle, as opposed to the next illustration of an LCD display viewed from an angle:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below an LCD display \u2013 An LCD display viewed from an angle creates problems because the tones varie from one side to the other:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And finally, below are two images that show the difference in colour on screen and in print:\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thank you so much for the insightful article into the world of colour correction, Paul!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>After a rather long sabbatical, PrintWild is back in action and ready to take the blogging world by storm! Paul (Snr) Changuion wrote this article on his experience over the last few weeks with colour correction: \u201cHaving spent many years correcting and printing colour images, the past two weeks have been really interesting. Colour management [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-342","post","type-post","status-publish","format-standard","hentry","category-tips-and-tricks"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PrintWild Blog: The World of Colour Correction<\/title>\n<meta name=\"description\" content=\"\u201cHaving spent many years correcting and printing colour images, the past two weeks have been really interesting.&quot; Colour correction is a huge subject!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.printwild.co.za\/news\/the-world-of-colour-correction\/\" \/>\n<meta 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