Set colorbar ticks after use of hsv2rgb

Hi there,

I would like to change the ticks of a colorbar that has been previously converted from an hsv to a rgb image with the function hsv2rgb.

I have an image imHsv whose hue imHsv(:,:,1) ranges between 0 and 1 (more precisely between 0.1 and 0.9 because I want to exclude the red color)

then I converted it to an rgb image: imRgb=hsv2rgb(imHsv);

and plot it with figure; imagesc(imRgb)

now I would like to set the colorbar such that the 8 values (0.1 : 0.8/7. : 0.9) of the previous imHsv(:,:,1) corresponds to the eight values (-70:10:0) that should go on the colorbar ticks. What should I do?

Many thanks!