Quote:
Originally Posted by Peter Ward
This is a striking image, but the colour has me quite puzzled. 
A standard SHO palette of this area would not be so orange if you'd mapped the SII to red, H-alpha to green and OIII to blue
....likely more green as I suspect the area is dominated by H-alpha
(see Gleason 2018)
But as a result, that orange palette makes it tricky to see where the SII and Ha regions are in relation to each other. (and I'm not even Catholic  )
Assuming the thin...and quite elegant...shock-front is emitting strongly in OIII then it makes sense that you'd not want to mask that and shift the palette to enhance that contrast. Is that what you intended? |
Thanks Peter. You are right that, like most narrowband objects, if purely mapping Ha to green that the green is more prominent. As an aesthetic choice I did adjust the colour palate so that it was more gold and blue. I tried to strike a balance where the SII regions where still visible as being redder, the OIII had good colour contrast, and that there was good tonality in the gold hues. The figure in the paper had a bit more green in the Ha and we also included a bicolour Ha & SII, where Ha was mapped to red and SII to blue to help highlight the location of the shocked filaments 👍