How can i separate four bands from a tif image.

Question

AFZAL 2014-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/159449-how-can-i-separate-four-bands-from-a-tif-image

评论： Amira Jbara 2018-2-19

采纳的回答： Mohammad Abouali

I have a satellite image with four bands R,G,B and NIR,how can i separate this bands.

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Amira Jbara 2018-2-19

comment faire affichage de l'image avec les 4 bandes sans séparation ????

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Answer 1

Mohammad Abouali 2014-10-21

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Read the image using imread or geotifread as regular Let's say i issued:

I=imread('satimage.tif');

then I is of size MxNx4

Then each band can be simply separated as:

Band1=I(:,:,1);
Band2=I(:,:,2);
Band3=I(:,:,3);
Band4=I(:,:,4);

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shalitha ramanayake 2017-5-6

编辑：shalitha ramanayake 2017-5-6

hey this is this M*N mean that row*column in the image and 4 means the number of bands in the satellite image. if this is correct please reply me or correct me

Walter Roberson 2017-5-6

编辑：Walter Roberson 2017-5-6

Correct, shalitha ramanayake.

TIFF has several ways to store multiple bands, and a simple imread() can only handle a limited number of cases. If I understand the TIFF specification properly, then a simple imread() can only handle RGB together with at most two other bands: if there are more than two non-RGB bands then I believe that you would need to either use a different form of imread() or else you would need to use the Tiff() class to do the reading.

If you have only one non-RGB band (such as NIR) then if a simple imread() returns something with third dimension length 4, you can probably assume that the order of the bands is R, G, B, and then the fourth band. This is not entirely safe to assume, however.

If you have two non-RGB bands, then if a simple imread() returns something with third dimension length 5, you can probably assume that the order of the bands starts R, G, B, but it becomes tricky to figure out what the order of the other two bands would be.

If you have a TIFF with anything other than grayscale, or plain RGB, or RGB together with Alpha, then it is safest to use the Tiff() class to analyze the file.

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