Image Processing; converting images

2017 7 6
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更新时间：2017 7 6
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Hi guys. I have images in .im7 format. I've loaded them into Matlab using PivMat and ReadIMX, then formatted them into .mat files ( images ? ). Now, I'm trying to covert them to either .jpg , .tif , .png , .bmp using imwrite but I cannot do so because 'type was struct'. Can I efficiently go from 'structure' format to any of the formats that imwrite recognizes ?

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KSSV
KSSV 2017-7-6
You have to extract the required pixel information from the structure and use imwrite.
Thank you. If you don't mind me asking: what information would that be ? x ( 1x2048 double ) and y ( 1x2048 double ) and also w ( 2048x2048 double) also the unitx and unity are 'mm' - how'd I deal with that ? These are probably really stupid question, but I just want to make sure if I'm doing it wright.

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KSSV
KSSV 2017-7-6

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You need to pick the matrix 2048*2048 and use imwrite
https://in.mathworks.com/help/matlab/ref/imwrite.html

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Thank you again. When I'm trying to do so it spits 'Too many output arguments' out. Do you know why ?
KSSV
KSSV 2017-7-6
Give the code what you have tried...You should only send the required matrix into imwrite
A = rand(2048);
imwrite(A,'myimage.png')
KSSV
KSSV 2017-7-6
I guess you used something like
out = imwrite() ;
No imwrite doesn't give you any ouput, it writes your matrix into the filename and format which you have specified in the given folder.
yes, I was doing that. Thank you so much. But now, even when I do it as I should have been doing, it displays a white rectangle
KSSV
KSSV 2017-7-6
What data does matrix have? Attach it.
The file is too big to attach it. The entries of the matrix are integers ranging from 100 to above 1000 if that helps ?
Thorsten
Thorsten 2017-7-6
编辑：Thorsten 2017-7-6
Imwrite assumes double input data to be in the range [0, 1]. Everything above 1 will be mapped to 1, resulting in an all-white image. So you have to map your data to the range [0, 1].
Thank you Thorsten, used mapminmax to map my data to desired range, not sure if that's what you meant ? It now displays the image ok, but with horizontal black thin lines ? There are also, hardly visible, white thin vertical lines along the image ? Any idea what might be causing it ?

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Image Analyst
Image Analyst 2017-7-6

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Try this:
storedStructure = load(filename) % Don't use semicolon
% Now extract the image field into its own variable.
rgbImage = storedStructure.myImage; % Or whatever the field for the image is called.
imwrite(rgbImage, 'my RGB image.PNG');

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