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I wouldn't worry about looping over only 307200 pixels.
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I wouldn't worry about looping over only 307200 pixels.

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Ok, so i'll just loop through these
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I have an image which is 640x480<br />
The image is a JPEG with radiometeric data behind it (i.e. i can tell the heat temperature of each pixel)<br />
This is used to see how hot or cold areas in the image are<br />
<br />
What I need to do next is to have a semi-transparent layer over the image, and color the area <br />
i.e.<br />
0-50f = blue<br />
51- 100f = red<br />
101-300f = white<br />
<br />
when you view the image, you will be able to see transparent blue red and white sections.<br />
<br />
I was thinking of looping through every pixel, and reading the temperature, and then applying the associated colour<br />
However I was thinking a foreach loop might take a while and was wondering if there was a more efficient/quiker solution?
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I have an image which is 640x480
The image is a JPEG with radiometeric data behind it (i.e. i can tell the heat temperature of each pixel)
This is used to see how hot or cold areas in the image are

What I need to do next is to have a semi-transparent layer over the image, and color the area 
i.e.
0-50f = blue
51- 100f = red
101-300f = white

when you view the image, you will be able to see transparent blue red and white sections.

I was thinking of looping through every pixel, and reading the temperature, and then applying the associated colour
However I was thinking a foreach loop might take a while and was wondering if there was a more efficient/quiker solution?

semi transparent layer coloring image depending on heat/temperature reading

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