Why can't I save this BMP file in an array after converting it?

Hi!

I can't save the attached BMP file in an array after converting it to class double.

[tmp, cmap]    = imread('10.bmp');
tmp            = ind2gray(tmp, cmap);
gabDouble{i}    = im2double(tmp);

Saving images (JPGs) as class double in an array works without any problems.

Would be nice if someone knows what the issue is.

Many thanks!

[John Kau]

Hi Walter,

"i" is one in the algorithm. The culprit I believe is the BMP file. With other images this works like a charm.

[Walter Roberson]

Are you observing an error message?

[John Kau]

The error message was saying something along the lines like "Cell contents reference from a non-cell array object"

The thing now is that after a restart this morning, the error message no longer comes up. I promise that I haven't changed anything.

[Jan]

@John Kau: Please post as an answer, that you've solved the problem by restarting the computer and accept it. Of course we believe, that you are convinced, that you have not changed anything. But without any doubt restarting the computer removed the problem, e.g. by saving a changed M-file. So you did change something, even if you are not aware of what it was. Computers are not magic!

Answer 1

[Image Analyst]

I've never heard of BMP format being able to store floating point values. I only hear of integer values. Where in https://en.wikipedia.org/wiki/BMP_file_format do you see that it can take floating point values? If you want to store floating point values, you can save it with save() in a .mat file.

[John Kau]

Thanks! I didn't know that, I'm still too new to all this.

Answer 2

[Walter Roberson]

You did not initialize "i", so it will have its default value as being sqrt(-1), the imaginary unit. You cannot index a cell array at an imaginary unit.