Tag: luminance
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second slice
CLICK ON THE PICTURES TO ZOOM! still 2 small triangles left, this “slice” contains a neutral almost at the middle of it, it’s a pity that the paper doesn’t remains flat…
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hi-resolution pictures of the prototype
CLICK ON THE PICTURES TO ZOOM! Light ON/OFF, hi-resolution orthographic panorama made with Hugin. For me, there’s not much difference between such a work (the prototype, made of laserprints on paper) and a “traditionnal painting.” I’m really starting to think it’s just the same thing, like Richter includes amateur photography in the field of “painting.”
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Light Transformer Prototype v.2
The prototype is finally finished! So, to explain in a few words: 1-the amount of light projected by high-power spots on the wall has been measured. 2-an algorithm has been created to absorb the light using black over white laser-prints until the wall’s surface emits the same amount of light to the eyes of an…
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about to end
The central part being equalized. Something is slightly wrong – the values are increasing where the light is intense -, but it’s still very close to what I wanted (an equalized luminance everywhere in the rectangle).
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overview of the first layer of correction
CLICK ON THE PICTURE TO ZOOM IT! The “pool” in the middle is due to the limit of absorbance of the black (the contrast is too high between the dakest and the brightest part of the wall.) NOTE: this picture is 10 times smaller than the original (the blog doesn’t support extra large pictures…) to…
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good & bad news :)
The bad news: the laser printer cannot handle large black prints, some unit of the printer makes a random glossy layer on it. the random gloss the (very) good news id that the luminance correction is not very angle-dependant, means that except for that random gloss, the correction works at a wide variety of viewpoints,…
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a good “flat”
CLICK ON THE PIC TO ZOOM! Here it is: a “flattened” wall, made of a white wall, 2 halogen lights & 1 spotlight, white paper and black toner ink. The numbers, L* values in photoshop color picker, are approximate and dont take into account vignetting of the camera, but basically it works! And the…
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equalization success!
Adrien Lucca & Robert Ochshorn, Aalst, 30th June 2012. The 3 squares on the left were exctracted from the picture. The light is almost perfectly equalized. My Minolta Luminance-Meter gives values 15-17 cd/m² all over the covered surface of the wall. Robert has to go to Nepal, I’ll continue alone next week. Thanks Rob’…
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uniformizer prototype
CLICK ON THIS PICTURE TO ZOOM IT! Thanks to the measurement work and to a script made by Robert O., we were able to generate this first approximation of the wall luminance correction. This is a laserprint (printed in ABC Europe, Brussels) @ 400 DPI, 90 x 230 cm. 3 kinds of patterns were generated:…
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ideal lamp simulation
Simulation of the light coming from a punctual source (imagine a microscopic star) and diffused by a surface that is a “perfect diffusor.” The lamp is at a distance of 1 unit of the center of the surface that measures 6 x 6 units. The luminance for black pixels is set at 5%, and at…