TASImage read from file not displayed (correctly)

If store canvas from `tutorials/image/rose_image.C` into file, read it back and draw,

most of the images are not drawn. On the terminal I see errors:

```

libpng error: invalid screen gamma in png_set_gamma
libpng error: invalid screen gamma in png_set_gamma
libpng error: invalid screen gamma in png_set_gamma
libpng error: invalid screen gamma in png_set_gamma
Error in <TASImage::Paint>: no image set
Error in <TASImage::Paint>: no image set
Error in <TASImage::Paint>: no image set
Error in <TASImage::Paint>: no image set

```

Seems to be, all images which are internally stored in PNG format, fails.

Two remaining images are shown with palette, which is not a case with original macro.