Y’CbCr (“YUV”) conversion – part 1
Ok this week let’s try something a little bit more useful than random manipulation of one picture. Starting from the same beautiful Yosemite picture, we will convert it from RGB color space to Y’CbCr...
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Y’CbCr (“YUV”) conversion – part 2
Now the fun part : the implementation using Processing.js We will load the original picture as in the previous example: img = loadImage(“Yosemite.jpg”); Then we will go through all the pixels by 2...
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Luma histogram
In the previous post we created 3 channels from the RGB original picture : Y’, Cb, and Cr. We will now look that the luma histogram, so using the Y’ channel computed in previous post. What is an...
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Macro photography with a smartphone ? DIY !
Creativity is often allowing us to solve some nice problems. Like, let say, taking macro photo without a macro lens. Plenty of tricks exist and can best be done with interchangeable lens cameras. These...
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Contrast enhancement – part 1/2
In the previous image processing posts, we built a luma histogram from a RGB picture. In the next posts, we will work on contrast enhancement. We will use the luma channel, and define 2 luma stretch...
View ArticleColor saturation enhancement and Y’CbCr to RGB conversion
Before finishing the contrast enhancement started in previous post, we need to add a Y’CbCr to RGB function. It will allow us to close the loop : RGB=>Y’CbCr=>contrast enhancement on Y’=>RGB....
View ArticleEmbedding a Processing.js sketch in a WordPress page
Processing.js is very handy, and it is very cool to run your sketches in your browser. I was looking around for one easy way to embed a sketch into a WordPress page or post, and found a good option. I...
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Contrast enhancement – part 2/2
All right, now that we added some missing bricks, like Y’CbCr to RGB , we can finish our contrast enhancement started in the post Contrast enhancement – part 1/2. The goal is to tweak poor contrast...
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My new GitHub account
Hi there, I just created one account on GitHub, and added a GPL license on all the samples published so far on this site. Find everything in this repository :...
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