Image resizing and saving using imwrite

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hi...i need to resize the images to 512x512 and then save the image....m using imwrite to save but it saving it as blank images...my code is as below...plz help asap..
a=imread('1.jpg');
b=double(a)+1; %converting uint to double
c=imresize(b, [512 512]);
imwrite(c,'1f.jpg');
figure,imshow(a,[]);
figure,imshow(c,[]);
  2 Comments
Jan
Jan on 14 Apr 2014
@Horia: setting a flag is though to inform the admins about a question which conflicts with the terms of conditions. So please remove this flag and post a new question instead. Thanks.

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Accepted Answer

Jan
Jan on 27 Apr 2012
If you work with images in DOUBLE format, limit the values to the interval [0, 1]. Therefore prefer IM2DOUBLE instead of double(a)+1.
  4 Comments
Jan
Jan on 13 Apr 2014
@Horia: I do not agree. Converting to logical can work for black&white images only. For color images working in the DOUBLE format is sufficient, when you call imwrite with the correct inputs. If you have troubles, please post the corresponding code and the used type of the inputs.
Image Analyst
Image Analyst on 14 Apr 2014
Horia's "Flag" moved here:
I had to use: Convert grayscale to binary MyBinary = (MyGray > 0.5); when trying to resize a transparent .gif image. Otherwise (with double(imread(('image.gif'))), I had a correct image with imshow, but imwrite('...','TransparentColor',1) saved a totally black transparent image.

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More Answers (1)

Image Analyst
Image Analyst on 27 Apr 2012
Don't convert to double. jpg images expect uint8 values.
  3 Comments
kunal bhandari
kunal bhandari on 27 Apr 2012
converting to double is necessary for my further prgms...i have tried saving in other formats also but with the same result...
Image Analyst
Image Analyst on 27 Apr 2012
If you want to save double images and will use them only in MATLAB, then I recommend saving them as a .mat file. If you want a visualization so that you can see them in other programs, like a jpg file, then use 255 * mat2gray() to scale to 0-255 before saving in a standard format like BMP, TIF, PNG, JPG, etc.

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