how to solve too many arguments error?

when i try to display multiple images using the formula below. i get error of too many arguments. when i execute the first statement , it gives me error. what am i doing wrong? the code is as follows:

if true
  % code
[X1,map1]= image; ///image variable contains original jpg image.
[X2,map2]= image2; /// image2 variable contains transformed image.
subplot(1,2,1), imshow(X1,map1)
subplot(1,2,2), imshow(X2,map2)
end

Answer 1

[Guillaume]

Note: it is recommended that you do not use image as a variable name since it's already the name of a function in matlab.

The syntax [X, map] = is normally used in conjuction with imread to load an indexed image (rgb or grayscale images don't have an associated colour map), as in:

[X, map] = imread('someindexedimage.bmp');

Now, since the jpg format does not support indexed images, you'd never use that syntax for a jpg image.

Furthermore, the syntax

[something, something] = someothervariable;

would never be valid, since you're trying to assign a single variable into two variables.

In the end, if image and image2 are truly jpg images, then to display them simply:

subplot(1, 2, 1), imshow(image);  %would be better called image1
subplot(1, 2, 2), imshow(image2);

Or you could do:

imshowpair(image, image2, 'montage');

[hardeep thethi]

your first option worked for me. the imshowpair brings an error- Undefined function or method 'imshowpair' for input arguments of type 'uint8'. what if i want the two images to appear in one axis since one is transformation of other is it possible and how?

[Guillaume]

You need the imaging toolbox for imshowpair.

As far as I know, you can only have one image per axis. If both images are the same height, you can always do:

imshow([image1, image2])

to have them side by side.

Answer 2

[Kishore Kumar]

if true
  % code
  X1 = image;
  X2 = image2;
  subplot(1,2,1), imshow(X1,map1)
  subplot(1,2,2), imshow(X2,map2)
end

[hardeep thethi]

hi thanks for taking time to answer, but the code is giving me error of -undefined function or variable 'map1'.