Object name / Catalog Number: M3
Camera (specific model): DSI II Colour
Number of Exposures & Exposure length: 21 x 5.7 secs, dark frame subtraction and drizzle
Scope: Model, Aperture and F ratio: LX90, 10" F6.3
Filters used: IR blocking supplied with DSI II colour camera
Additional Information
Guide camera/scope: Unguided, Alt /AZ mounted
Image Capture Software: Envisage
Processing software: Photoshop elements 5.0 and Astronomy Tools
Other:
Date of capture: 7th April 2007 21:57
Date Processed/Reprocessed: 15th April 2007
1. Examined all images and selected best quality for processing
2. Stacked individual sets of R, G, B and L files using Envisage
3. Loaded the 4 RGBL files into Photoshop Elements using Fits Liberator addin
4. Uses a log stretch and adjusted black and white points in Fits Liberator to provide good balance and contrast
5. In Photoshop Elements, changed each to RGB and set Hue / saturation as follows B (240, 100, -50) G (120, 100, -50), R (0, 100, -50)
6. Stacked R, G and B image as separate layters on top of L image. Setting layer blend to screen for each
7. Adjusted the levels and used despeckle filters with layer masks to remove noise.