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Tim Chang

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Everything posted by Tim Chang

  1. This is interesting: https://m.youtube.com/watch?v=8JrqH2oOTK4 This guy points out that video lcd screens have a fresnel lens layered in there that disrupts the inverse square drop off and extends the brightness range of the diffuse transmission, making for a more realistic "cloudy sky" look. I've always thought this could be a useful trick lighting an indoor set through fake windows. TC
  2. There is this (go to 1:43:00). Bruce Nicholson talks about Star Wars 1977 blue screen opticals. https://www.youtube.com/watch?v=iOxfmq0nCEs TC
  3. Just be sure you're on your game when Bill Shatner is your voice talent: TC
  4. Before the surgery I, too, predicted that this would be the case. I thought I would wake up, say to myself "Wow, everything looks bluer," then after 5 minutes my brain's firmware would autmatically colour correct my vision back to the way I was used to experiencing it. Hence the reason I am so shocked that I was wrong. It's been a couple of weeks now and I am still surprised by the blueness (to be more accurate, I gues this should say, "The lack of yellowness"). I am thinking that the reason your father and your friend stopped noticing the blue was not because of psychovisual colour correction, but familiarity with the new "look" - i.e. it simply became unworthy of comment. what happens is that the "straw CC filter" that is embedded into your aging lenses causes blues to appear darker and less saturated (not that you would be conscious of this, of course). So if you were colour grading your work to make a neutral looking scene (that is to say. well balanced with the reds and greens), you compensate for your vision by boosting the chroma in the blues and also brightening them. However, the only people who would notice this would be those that are much younger than you, and even then they would probably just say to themselves, "Oh, that's just his visual style". John, l also did your blink test to compare the old lens with the new one, but my results were different. I could easily tell the difference between the yellowish vision of the old aging lens and the comparatively bluish cast through the new one (This was proof that the psychovisual colour correction that the brain does is not applied separately to each eye, but to the overall "fused" image that is the combination ofleft and right.). However, I did this test by looking at a blank white sheet of paper. With normal outdoor scenery it was difficult to tell the difference because of all the confusing detail and tones. Tim
  5. I recently had surgery for glaucoma. A by-product of this was having the lenses in both eyes replaced with artificial ones. My doctor says the cataracts weren't that bad, and only slightly worse than average for someone 50 years old I am totally blown away by how "blue" everything looks. Especially exterior daylight, which I assume to be more UV light being passed through to my retinas. Even indoors, blue objects (especially on computer monitors) are distinclty more bluish. This makes me think that the aging population of photographers are seeing images much differently than the young. In other words, if you're over 50 and think you are accurately judging the colour grading of your photography for all audiences, you are fooling yourself. All the bluer tones in your work will be boosted unnaturally fromthe point of view of someone only 20 years old, viewing the exact same image. Has anyone else thought about the ramifications of this to professional photographers? Tim
  6. A last ditch option could be to measure up your camera and design and print your own custom lens cap with a 3D printer (the plastic seems to have just the right stiffness-flexibility for lens/body caps).
  7. Repetitive actions like these require special treatment because although the eye may miss the first 1 or 2 or 3 frames, we have a special sensitivity to rhythm, which means that if you repeat a few frames (or delete them for that matter), the timing of the rhythm will be off. This will be especially nocticeable when there are sound effects accompanying the action (in your example, the "chop" spot effect with each stroke of the axe). Tim
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