inserting a picture with no background in GUI

Hello, I am trying to insert an image in to my GUI. I created axes and imshow and when I run the GUI I can see the image. My problem is my image has no background (i don't want it to have a background) and when the code runs I get all black background and the image. Any ideas why GUI does that and how I can prevent it from happening?

I attached the image if that helps.

Thank you

[Jan]

Please explain, if the image is indexed or in true color.

Answer 1

[Jan]

If the image is an indexed imaged with a colormap, set the pixels of the image's background color to the background color of your GUI.

[Kamuran]

First, I dont know what is indexed imaged with a colormap but even it is not. Why Matlab does what it does and insert a black background to my GUI?

Answer 2

[Image Analyst]

You didn't attach the image. An image must be rectangular. If MATLAB can take PNG files (which can have transparent pixels) and show you the figure background underneath the axes, then I don't know how to do that. Do you know for certain that you have transparent pixels and a PNG image? If you don't then there must be something in all areas of the image, so if not black, then what should it be? How are you displaying the image?

[kyana shayan]

Hi every one, I have the same problem with my PNG file. when I adjust the image to the axes, all I can see is black color for the background. My GUI has already have an image background, and I need this logo above all the figures. Please find attached my png file.

[Image Analyst]

It displays for me. Describe exactly what lines of code you're executing when you "adjust the image to the axes".

[kyana shayan]

axes(handles.axes3);
axis equal
I=imread('imageedit_1_2738085135.png');
imagesc(I)

[kyana shayan]

Here is how it displays the png file in two different menus.

[Image Analyst]

Yes, I got that, but in gray scale because I used imshow() instead of imagesc() which applies some colormap automatically for some reason. So, what's the problem? Do you not like the colormap? What do you think the image should look like?

[kyana shayan]

I want it with no background color. besides, I need those numbers gone. I want it like the attached picture.

[Image Analyst]

I'm not familiar with how or if transparent pixels work with PNG images, like if you can put an axes with a PNG image in it that has transparent pixels over another axes with a regular RGB image in it and have the underlying RGB pixels show through the transparent regions.

You could make a mask and then assign the non-transparent pixels to the RGB image to create a new RGB image with the images combined. Would that work for you?

[kyana shayan]

I don't know how to do that? can you be more specific?