why i cannot display an image

I have done wavedec2 on an image and extracted the approximate coefficients using appcoef2.I want to display the approximate image but its showing total white.why is it so. how to get the image?

[Dishant Arora]

show us your code, it would be easier to find where you went wrong.

Answer 1

[Walter Roberson]

use imagesc() or use imshow() with [] as the second parameter.

[Image Analyst]

The reason "why" is because it's probably a floating point image, and if so, imshow() expects all floating point images to be inthe range 0-1. If it's more than 1, it will get clipped to 1 and show up as all white (255 on your display). Using [] will scale your image to 0-1, which is the range it wants, and then display it. If you use imagesc() it picks some funky default colormap (not grayscale like it should default to) that you will probably want to change if you use that.

[Walter Roberson]

imagesc() picks up the current colormap, whatever that happens to be.

[Sapam Jaya]

it helped..thnx

Answer 2

[john]

please solve this issue , i have try hundred of times

command line error is

Attempt to execute SCRIPT image as a function:

C:\Users\ejaz\Desktop\working space\image.m

Error in images.internal.basicImageDisplay (line 24)

hh = image(cdata, ...

Error in imshow (line 293)

hh = images.internal.basicImageDisplay(fig_handle,ax_handle,...