Narrowband video tutorials - first three parts.


Staff member
Hi all,

We just released three new video tutorials focused on assembling and processing a Hubble's palette image. The first video's main topic is about color calibration of this type of image. You'll see that's possible to achieve a good color representation with the simple workflow we propose, using only the official tools of PixInsight:

In the second video, we show a technique called "palette polarization", a simple technique to control the color representation with PixelMath. The video shows how easy and powerful is the PixelMath tool:

In the third video, we discuss how to control the color strength of the resulting magenta stars after we calibrate the color of the nebula:

More videos about this topic are coming. I hope they help you to realize working with this kind of palette is easy and fast in PixInsight.

Best regards,
Thank you, the videos are very useful. One question:

Are these color calibration techniques, a replacement or a complement to doing it via SPCC in narrowband mode?
Hi Marcelo,

Good point. For Hubble's palette, SPCC and PCC don't work at all. The reason is that they would leave the nebulae completely green since the goal of these tools is to give you the real proportion of the emission lines. For an HOO palette it works very well since it adjusts the brightness between H-alpha and O-III, giving you the correct teal tone. It could also work very well if you have, for instance, O-III / N-II / S-II or O-III / H-beta / S-II. But, in SHO, you just want to have the three emission lines at the same intensity.

In this case, only ColorCalibration works. PixInsight philosophy has been always to give you maximum flexibility. This example shows that, in some cases, the only tools that work are the older ones.