Thread Subject: imread Help

Hello, I'm wondering why I always get an empty 0x0 double
returned for the 'map' when I use imread.

I'm using the command:

[Img,map] = imread(ImageFilename);



I have tried different image file types and get the same
thing for my map every time. Does anybody know why I am
getting the empty 0x0 double instead of a colormap rescaled
in the range [0,1] ?

Thanks for any input

In article <g2pbgm$cik$1@fred.mathworks.com>, tkeil <tlkeil@vradc.com> wrote:

>Hello, I'm wondering why I always get an empty 0x0 double
>returned for the 'map' when I use imread.

>I'm using the command:

>[Img,map] = imread(ImageFilename);


>I have tried different image file types and get the same
>thing for my map every time. Does anybody know why I am
>getting the empty 0x0 double instead of a colormap rescaled
>in the range [0,1] ?

You get an empty map if the image is RGB. Colour maps only apply
to indexed images.
--
  "All is vanity." -- Ecclesiastes

tkeil wrote:
> Hello, I'm wondering why I always get an empty 0x0 double
> returned for the 'map' when I use imread.
>
> I'm using the command:
>
> [Img,map] = imread(ImageFilename);
>
>
>
> I have tried different image file types and get the same
> thing for my map every time. Does anybody know why I am
> getting the empty 0x0 double instead of a colormap rescaled
> in the range [0,1] ?
>
> Thanks for any input

If you are getting an empty colormap, then the file does not contain a
colormap. Either the image is stored as gray scale or as truecolor.