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bmp and jpeg images in matlab

 
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cedance



Joined: 24 Oct 2003
Posts: 704
Helped: 28
Location: Germany
Post30 Sep 2004 19:04   bmp and jpeg images in matlab
hi,

when i try to import a jpeg image using matlab i get the RGB vectors/matrix respectively. but when i did the same for a bmp file i dint get the RGB. i got only a 1 * () matrix. wats the problem? how do i get the RGB components for a bmp file...

if am not clear enough.. pls tell me so that i would explain it further...

regards,
arunmit168.
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Element_115



Joined: 23 Mar 2002
Posts: 312
Helped: 21
Post30 Sep 2004 23:36   Re: bmp and jpeg images in matlab
Are you just trying to convert the file or alter it?
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starfish



Joined: 08 Jul 2004
Posts: 73
Post01 Oct 2004 18:26   Re: bmp and jpeg images in matlab
Hi.....

I tried the following code........It gives no problem which u are suggesting.........Here i used imread command to read image......the image name is 'test.jpg' and i saved the same image named 'test.bmp' as a 24 bit bitmap......Then i used the following commands.....I am copy pasting the exact commmands for convenience.........

I used 'size' function to check the dimension of both images the jpg and bmp formats..............both are 3 dimensional.....thus representing R, G , B component value........... SmileSmileSmile.......

If any more help needed plz message me.......

>> a=imread('c:\test.jpg');
>> size(a)

ans =

965 665 3

>> b=imread('c:\test.bmp');
>> size(b)

ans =

965 665 3

>>
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starfish



Joined: 08 Jul 2004
Posts: 73
Post01 Oct 2004 18:38   Re: bmp and jpeg images in matlab
I can upload the images used in above commands if u want it.....

Just tell me........Bcz bitmap image is 1.83 mb .........so i am not uploading now......but if u need i can upload...............Smile
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djalli



Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
Post02 Oct 2004 8:33   Re: bmp and jpeg images in matlab
starfish wrote:
bitmap image is 1.83 mb .........so i am not uploading now......


Compress it with ZIP. Bitmaps compress a lot. I bet that 1.83Mb would become 100kb zip file.
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starfish



Joined: 08 Jul 2004
Posts: 73
Post02 Oct 2004 17:35   Re: bmp and jpeg images in matlab
1.94 mb compressed to 1.03 mb using winrar software Smile .......

Here are the images Rolling Eyes

Sorry, but you need login in to view this attachment
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cedance



Joined: 24 Oct 2003
Posts: 704
Helped: 28
Location: Germany
Post05 Oct 2004 17:42   Re: bmp and jpeg images in matlab
starfish wrote:
Hi.....

I tried the following code........It gives no problem which u are suggesting.........Here i used imread command to read image......the image name is 'test.jpg' and i saved the same image named 'test.bmp' as a 24 bit bitmap......Then i used the following commands.....I am copy pasting the exact commmands for convenience.........

I used 'size' function to check the dimension of both images the jpg and bmp formats..............both are 3 dimensional.....thus representing R, G , B component value........... SmileSmileSmile.......

If any more help needed plz message me.......

>> a=imread('c:\test.jpg');
>> size(a)



ans =

965 665 3

>> b=imread('c:\test.bmp');
>> size(b)

ans =

965 665 3

>>


yeh.. i did a mistake... i directly entered "imread('blue.bmp')" without converting it into a 24 bit file... thanks for ur reply. and what is the difference between the ordinary way of saving a bitmap as 16 color bitmap and as a 24-bit file???

regards,
arunmit168.
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