Re: Image processing

[Moo]

Erika - the third number is the third "dimension" of the image, which is number of channels in your image.  So for example, in a greyscale image or an indexed image the number should be 1.  In some color images (it has to do with the file format; .jpg, .png, etc), the third number is 3, indicating red, green, and blue (RGB) channels.  The only other number you might see is 4, indicating cyan, yellow, magenta, black (CMYK) channels.

Keep in mind that, depending on what you're actually doing to "compare" the images, you might have to take that into account.  I can't go into the details, but if you know specifically what you're going to do I could probably help.

On Fri, Jun 11, 2010 at 2:30 PM, Erika Bueno <address@hidden> wrote:

I made what you explained with a GIF image and when I use size(myimg),
it shows three numbers. The first and the second are rows and columns,
what is the third number?

Thanks again :)

2010/6/9 Erika Bueno <address@hidden>:

> Thanks, Soren! I'm gonna try this in the morning, when I get to the
> lab and I'll tell you if I got it :)
>
> Good night! :)
>
> 2010/6/9 Søren Hauberg <address@hidden>:
>> ons, 09 06 2010 kl. 02:39 -0300, skrev Erika Bueno:
>>> I'm gonna try :)
>>>
>>> I read the image, just like you explained me to do. It works.
>>>
>>> I know the image is saved in the variable "i" as a matrix, right?
>>>
>>> Ok. But I don't know the size of the matrix. So, how can I work with
>>> something that I don't know its extension?
>>>
>>> My project is to read a couple of images and, then, compare then. To
>>> do this, I gotta read the images and work with its variables as
>>> matrices.
>>>
>>> Got it now? :)
>>
>> Yes I think I got it, thanks :-)
>>
>> To get the size (or extension as you call it), simply call
>>
>>  size (I)
>>
>> this will be a vector with the number of rows in the image on the first
>> place and the number of columns in the second place.
>>
>> Søren
>>
>>
>

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