script that tells number of black pixels

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mut

05/24/2006 02:46:06 PM · #1

I have a question, please:

I have > 2000 tif-files that contain only black and white pixels (1-bit). I need a program or a script that tells me (automatically) the number of black pixels in each file. I do not want to open each file seperately to analyse the number of black pixels.

Does anybody knows a simpel solution for my problem?

Thanks, mut.

David.C

Nikon AF Nikkor 50mm f/1.8D

05/24/2006 04:30:09 PM · #2

Originally posted by mut:

... 2000 tif-files that contain only black and white pixels (1-bit). ...

I'm afraid I don't understand what you mean by (1-bit) -- are the images actually saved as monochome? If you're able, an example of what you have would help.

David

ignite

Canon EOS-500D Rebel T1i

Canon EF 50mm f/1.8 II

05/24/2006 04:46:14 PM · #3

1 bit means either a pixel is black , or white, nothing else. Here's an article that will help. A program written in C language to count black and white pixels in BMP images.

Linky

bod

05/24/2006 05:09:08 PM · #4

Imagemagick or libtiff should be able to help with the image decoding side of things.

mut

05/26/2006 04:30:09 AM · #5

Thanks for your answers. My problem is that the programs posted by ignite (and probably also the two others posted by bod) can only analyse one picture at a time and not several automatically.

I could send you a sample of my immages by mail, if you like, but I do not know your adresses. If you send me a mail, I will answer. My adress is "helmeiss (at) yahoo (dot) de"

Thanks.

jimness

Canon EOS-5D

Canon EF 20-35mm f/2.8L

05/26/2006 04:51:53 AM · #6

probably not very simple, but I think the .NET platform can analyse pixels in BitMaps (and other image types)...so you could develop something that looped through every image file in a folder, then loop through each pixel in each image and increment a count if the pixel is black
...if you're a programmer with .NET dev tools that is!

mut

05/27/2006 05:00:27 AM · #7

Thanks for all your helps!
Somebody wrote a small application in C for my problem, which works very well, but I do not understand the details...

Bye.

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