Issue with getframe()

I am saving the images generated inside the for loop using getframe () command. I have the following two issues.

1. I couldn't change the colormap
2. As shown in the image, double tick marks are appearing on the axis values

Any idea how to get rid of this?

Answer 1

[Walter Roberson]

The image is RGB; you cannot change the colormap on RGB images.

The image has tick marks drawn into it. When you image() or imagesc() it, the axes gets drawn including tick marks for the axes, which do not happen to line up with the tick marks that are part of the image. If you imshow(x3) then the axes will not be drawn.

[Turbulence Analysis]

Ok got it..

For instance, in the attached mat file, I have time stamp (in microseconds) of the image data stored in array ts and arrays x,y and I contains x,y co-ordinats and intensity.

I need to accumulate the data over 200 microseconds to create each image.

E.g, for the first first image (i.e. rows 1 to 4533 --> 69142-68942 = 200 microseconds) and for next image, I have to sum up another 200 micro seconds (i.e. 69143 to 69343) reprsented by rows 4533 - 8829

If I directly save the image, then I guess that won't be a RGB, in this way I can chnage the colro map.

Please share your suggestions