Take the tour ×  How can I place a mark, like a cross-hair (to
suggest "X marks the spot") and a text label associated with it,
at a particular position on an image (mine in particular is
Colorized)?  share|improve this question add comment  3 Answers
up vote 13 down vote accepted  This is a simple way:
Graphics[{PointSize[Large], Red, Point[{3 \[Pi]/2, -1}],
Black, Text["Minimum", {3 \[Pi]/2, -.8}]}]]  enter image
description here   If you have an image created with Colorize
you can apply the same method. In the example below img is the
image you obtain by taking the first example given in the Help
under Colorize.     Graphics[{PointSize[Large], Red, Point[{20,
100}],    White, Text["California", {30, 90}]}]]  enter image
description here  share|improve this answer My image is created
with Colorize and this gives Raster data contains 0 values per
pixel; 3 or 4 are required with ColorFunction->RGBColor, even
though it displays fine without the text. –  Emre Mar 30 '12 at
18:34 add comment  Another a