Images you can use to create a color composite

Two of the students in my Observational Astronomy class in the Spring, 2010, quarter -- Kurt Alvut and Louis Acresti -- took images of several objects through three filters with the RIT Observatory's 12-inch telescope and SBIG ST-8E CCD camera. They took 20-40 images, each 30 or 60 seconds in length, through the B, V, and R filters, performed the standard CCD processing on each image, then aligned and stacked the images in each filter to create a "master" image in each filter. Their plan was to make composite color images, using the B-band image for "blue", the V-band image for "green", and the R-band image for "red".

You can see their poster if you dare to look at this PDF document.

Here are their "master" B, V and R images of the Ring Nebula, M57. The B-band image is a composite of 40 images, each one minute long. The V and R images are composites of 20 images each, with the same one-minute exposure time per image. Can you put them together to create a nice color picture?

Here are their "master" B, V and R images of the Whirlpool Galaxy, M51. The B, V and R images are composites of 40 images, each thirty seconds long. Can you put them together to create a nice color picture?