Thread Subject:

How to show a gray image in a Gui axes ???

Hey @ all,

I converted a color(rgb) *.jpg image into a gray image. When
I want to show the image in a axes in the gui, it looks like
a rainbow. I saved the converted image and its pefect gray.
Why does the axes couldn?t display gray images??

Hope you can help me.

Greetings Jan

On Mar 15, 12:54=A0pm, "Jan Sieh" <corone...@gmx.de> wrote:
> Hey @ all,
>
> I converted a color(rgb) *.jpg image into a gray image. When
> I want to show the image in a axes in the gui, it looks like
> a rainbow. I saved the converted image and its pefect gray.
> Why does the axes couldn?t display gray images??
>
> Hope you can help me.
>
> Greetings Jan

------------------------------------
Jan:
Check the color map. Make sure you're using a gray color map. Maybe
it got assigned to something else prior to you stuffing the gray scale
image in there. Something like
imshow(myGrayScaleImageArray, []);
colormap('gray');

Regards,
ImageAnalyst

"Jan Sieh" <coronet67@gmx.de> wrote in message
<frguvc$mer$1@fred.mathworks.com>...
> Hey @ all,
>
> I converted a color(rgb) *.jpg image into a gray image. When
> I want to show the image in a axes in the gui, it looks like
> a rainbow. I saved the converted image and its pefect gray.
> Why does the axes couldn?t display gray images??
>
> Hope you can help me.
>
> Greetings Jan

Probable answer could be that you are using either image()
or imagesc() instead of imshow().
If you dont have ImageProcessing ToolBox then you wont be
having imshow(). Nevertheless you can use still update
grayscale images on the axes like;
image(yourimage);
colormap(gray);
as Image Analyst pointed out
HTH
VIHANG