fwm891 Posted May 11, 2013 Share Posted May 11, 2013 Finally pulled together data on M104 shot at various times this yearColour and luminance stacks combined in AA5Stack details:Luminance: 11x240s + 10x300s + 6x600sRed: 15x120s + 2x236sGreen: 12x120s + 2x600sBlue: 15x120s + 2x618sStacks registered in PS and processed in PS using curves and levels via adjustment layers. Some resaturation of the colour layers, luminance layer knocked back to 70% opacity.Uploaded as 16 bit png Link to comment Share on other sites More sharing options...
cfpendock Posted May 11, 2013 Share Posted May 11, 2013 Nice image, Francis. Could it be my screen, or do I imagine the colours aren't quite aligned?Chris Link to comment Share on other sites More sharing options...
Superdavo Posted May 11, 2013 Share Posted May 11, 2013 Nice image, Francis. Could it be my screen, or do I imagine the colours aren't quite aligned?Chris I thought that, the dust cloud looks strangely blue, but its a nice shot! Link to comment Share on other sites More sharing options...
fwm891 Posted May 11, 2013 Author Share Posted May 11, 2013 Mmmm Red looks off will check the layered image set Link to comment Share on other sites More sharing options...
fwm891 Posted May 11, 2013 Author Share Posted May 11, 2013 Right - checked things there's a problem (distortion) with the red layer. If I align the top-left / bot-right corners the others are out and vis-versa. The red and some of the luminance were imaged on a different night to the rest. I will have a play with the transforms in PS and see if I can get a better register.Meanwhile: A more central crop. Link to comment Share on other sites More sharing options...
cfpendock Posted May 11, 2013 Share Posted May 11, 2013 I find that colour aligning in PS is very accurate. I agree, the reds are out, but in this cropped version, nearly all reds are too low. If you could re-align in PS I think you would have an excellent image.Chris Link to comment Share on other sites More sharing options...
fwm891 Posted May 11, 2013 Author Share Posted May 11, 2013 Chris, agree reds are low. The error is less than 1 pixel so when the red channel is shifted the off-set is seen elsewhere. I've given it a tweak but its still not 'registered'. Link to comment Share on other sites More sharing options...
fwm891 Posted May 12, 2013 Author Share Posted May 12, 2013 Chris - I've had a session working on all layers (matched to luminance) in PS using the 'distort' function under edit/transforms to get the layers as near matched as I can.Not sure why the images are different perhaps I have a little slop in the focuser and imaging at a different angle on a different night has led to the misalignment ? Link to comment Share on other sites More sharing options...
Gina Posted May 12, 2013 Share Posted May 12, 2013 I use RegiStar to align my stacks - gives sub-pixel accuracy automatically Nothing else I've tried does as well. I used to have just that problem when I used PS to align stacks. Link to comment Share on other sites More sharing options...
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