Fireworks!

Cheers lads.
Following on from a query in another forum website, here's what I do in terms of processing:

First, I use the 300d and PST Foto R. For more detail, read:
tinyurl.com/kae9g

The exposure is 1/10th sec at ISO400. The detail is taken from a single image but processed separately between disc and proms. In the 300d color chip, there are twice as many green pixels as there are red or blue (50% Green. 25% Red and 25% Blue). I capture the image in RAW mode and convert to a 16bit TIFF with Imagesplus. However, I'm not up to speed on Imagesplus yet so I use Photoshop for processing.

In Photoshop, the red channel has the brightest signal with green a good bit behind and blue very faint. As the signal is H-Alpha, there should only be a signal in the red channel, however, due to signal leakage, the green and blue chips become fired.

As green pixels are the most popular, I use the green channel/layer for the disc as they will contain alot of fine detail. I adjust the levels and curves and apply unsharp mask.

The signal for the red is the strongest and shows the proms well but due to the exposure time, it washes out alot of detail on the dics. Therefore, in the red channel, I select the disc, blacken out all the detail on the disc and just process the red channel to bring out the proms. Here, I also play with the levels, curves and unsharp mask.

Then, I copy the disc and paste it on top of the proms image and hey presto, image complete.

With both layers, I then adjust the colours so that they appear orangey-red.

Regards,

Looks great, image and presentation. I must try that method with the 350D and my PST. I'm waiting for some clear skies to get going again. I take 2 seperate exp with the LU and stitch them together.

DaveG

Here's an image cropped to focus on some detail I captured from a few weeks ago. Experimenting with a border also. Good/Bad idea??
Canon300d-PST-1/10th sec exposure

Clear skies,

Nice presentation and great image!

Later,

Jed.