Issue Saving image with text overlay to png

I am having issues saving an image that has been displayed in a figure, with a couple markers plotted at specific coordinates and then text overlaid using the text function. I am trying to safe this off as a png via saveas(gcf,'filename.png'); and the figure exports but the overlaid text is missing. The title and the marker points I plotted show up but no text. Below is the figure.

Attached is the exported png using saveas

My code looks as follows:

figure; imshow(img,[]);
    hold on;
    plot(Stats(TestNum).Centroid(1),Stats(TestNum).Centroid(2),'b*');
    set(gca, 'ActivePositionProperty', 'OuterPosition');
    [filepath,name,ext] = fileparts(files(TestNum).name);
    title({[];name;['Original Image With Centroid Marked']},'FontSize',FontSize);
    text(20,500,{['Area = ',num2str(Stats(TestNum).Area.*pixel_scale^2,'%3.2f'),'mm^2'];...
        ['Eccentricity = ',num2str(Stats(TestNum).Eccentricity,'%3.2f')];...
        ['Orientation = ',num2str(Stats(TestNum).Orientation,'%3.2f'),char(176)];...
        ['Major Axis Length = ',num2str(Stats(TestNum).MajorAxisLength.*pixel_scale,'%3.2f'),'mm'];...
        ['Minor Axis Length = ',num2str(Stats(TestNum).MinorAxisLength.*pixel_scale,'%3.2f'),'mm']},...
        'Color','white','FontSize',FontSize);
    saveas(gcf,[pwd '\output\Test ',num2str(TestNum),'\TubeMidpointCrossSection - Test ',num2str(TestNum),'.png']);

[Will Reeves]

I have the same problem. My issue is, like the above, the image I'm writing text on top of is mostly black - I need white text. Please can "saveas" actually save "WYSIWYG-like"?

Answer 1

[Walter Roberson]

I recommend you take a different approach. Instead of plotting on the image and text() on the image, use the Computer Vision insertText and insertShape routines to etch the information into an RGB array. After that is done, imwrite() the array.

Answer 2

[Jia-Sheng Hong]

The text do exist after you save it, however, it become black again. You can set the 'BackgroundColor' of the text to white instead of set the text to white, and it should work.

Answer 3

[Will Reeves]

Sorry! I knew I once had the answer to this somewhere...

You need to put the line:

set(gcf, 'InvertHardCopy', 'off');

immediatly before issuing the "saveas" command.