GUI Imshow Quality Loss

Hello, I am trying to create a high quality image background for my GUI using the UIAxes method. However, even when I get the picture to the same size of the axes, the quality is lowered. I also cannot figure out how to get the fix specified here to work: https://www.mathworks.com/matlabcentral/answers/342392-quality-for-image-in-matlab-gui

Does anyone have a suggestion/prior experience getting a high quality background image on their GUI?

Answer 1

[Rahul]

Hi @James Clancy,

To obtain high quality images on a 'UIaxis', the following MATLAB Answer suggests scaling the axis based on the true size of the image incase 'image' or 'imagesc' functions are being used.

https://www.mathworks.com/matlabcentral/answers/342392-quality-for-image-in-matlab-gui

Here is an example:

im1 = imread('im1.png');
imagesc(im1);
axis image

Alternatively, 'imshow' function can be used to display an image on a 'UIaxis'. This function provides properties like 'InitialMagnification' and 'Interpolation' which can be used to improve the scaling of the image. Here is an example:

figure;
ax = axes;
imshow('im1.png', 'Parent', ax);
title('Original Image');

figure;
ax1 = axes;
imshow('im1.png', 'Parent', ax1, 'InitialMagnification', 'fit', 'Interpolation', 'bilinear');
title('Image after bilinear interpolation');

This is also mentioned in detail in this MATLAB Answer:

https://www.mathworks.com/matlabcentral/answers/1831728-imshow-poor-image-quality?s_tid=answers_rc1-2_p2_MLT

The following MathWorks documentations can be referred to know more:

'imagesc': https://www.mathworks.com/help/matlab/ref/imagesc.html

'imshow': https://www.mathworks.com/help/images/ref/imshow.html#namevaluepairarguments

Thanks.