However, after some research, I discovered that this algorithm would treat color RGB(1,0,0) = RGB(0,1,0) = RGB(0,0,1), meaning that it will mix pure red, green and blue pixels together.
I've tried it and works fine as stand alone version, how ever I want it intergrated in PhotoPost galery, that works also, but it shows a normal and mirrored histogram, and on some photo's no histogram.įinally I got it working, however a histo in Photoshop of image X shows a bit different from a histo generated with this routine, no editing was done to the jpg.ĭo you have any idea why the two histo's can differ?Īt first, thanks for this nice snippet of PHP code. I've done nothing to the code, just added a path to the picture I'm testing, what is causing this Notice: Undefined offset to appear? thank you!!įor our photo site this is an addition, I tried it and works, it generates the histo, but als allot of this:
#Php wideimage save image to mysql code
I ask please, do not have the source code of image retrieval based on histogram with php language?. This script works fine but I want also to expand, equalise, and smooth histogram Image operations in PHP take far too long to run in a dynamic page, you have to use some sort of caching to avoid problems. There isn't any faster way in PHP, you can use programs written in C for example to do it faster, you can set a higher value for timeout or you can save the histogram information in an additional and run the script several times.
#Php wideimage save image to mysql how to
how to avoid this problem.Is there any efficient method to extract the rgb values from the jpeg image. The method used in this article is a more simple one, which only takes into account the actual RGB value.īoth methods can be considered correct since the idea of "good" or "bad" image is purely subjective and depends on each individual.įirst I would like to thank you for posting this code.I have tried with single image itz working fine.I need to generate histogram of more than 1000 jpeg images.I have kept the images in a folder and generating the histogram for the images.The program is able to generate histogram for 170 images after that it shows exceeded 60 secs execution time at the line where the RGB values are obtained. The one described in the link above takes into account the response (sensibility) courve of the human eye and thus through statistical research, some weights were determined. How to convert an image to grayscale using PHPĪ grayscale version of a given color image can be defined in many ways and therefor there are more "equivalents". How to check if an image is grayscale in PHP
find the maximum in the histogram in order to display a normated graph
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