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How to apply false colour in Affinity Photo?


Owmuchonomy

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I have ditched Ps in favour of Affinity Photo for my Astrophotography.  However, I cannot fathom how to false colour my mono solar captures.  It was so easy in Ps, just use the tint mode but I cannot figure out how to do it in AP.  Anybody out there able to guide me?  Many thanks.

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On 02/04/2022 at 18:10, Yawning Angel said:

Adjustments in the right hand tray, levels

RGB gamma adjustments to suit. If it needs livening up, add a HSL level

I found it creates artefacts if you merge levels from right clicking, but is fine from the levels menu

Thanks for your reply but that just gives me the option to change black or white.  I'm trying to false colour a mono solar image as I used to in PS using the Tint function.

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7 hours ago, Owmuchonomy said:

 I'm trying to false colour a mono solar image as I used to in PS using the Tint function

Aye, easier to explain with pictures of a quick and dirty process

B&W image loaded, click levels
start.png.c7d1f72131e6af6c0ef2b3564b4fdc55.png

1.png.8134611b12c411fedab61c85beccb763.png

Select the Red channel and slide the gamma left to around 0.5 (Just as a starting point)
red.png.ede327dd01a7f7109e2382a55d4d13ec.png

Green channel, right to 1.2ish
Green.png.6489044bef4fdb38890ff386e44c049a.png

Blue much further, 1.8?
blue.png.a162b6d0115bfb79286420d0298644ce.png

Twiddle to taste, or get close then use HSL to nail it
done.png.e82b94f7022f1dfc478e671c1654e456.png

---Or---

You can use recolour to tint it, then HSL again to fine tune:
recolour.png.2ba362476e592b597b8b3b19d0ea0ae9.png

 

Hope that helps 🙂

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10 hours ago, Yawning Angel said:

Aye, easier to explain with pictures of a quick and dirty process

B&W image loaded, click levels
start.png.c7d1f72131e6af6c0ef2b3564b4fdc55.png

1.png.8134611b12c411fedab61c85beccb763.png

Select the Red channel and slide the gamma left to around 0.5 (Just as a starting point)
red.png.ede327dd01a7f7109e2382a55d4d13ec.png

Green channel, right to 1.2ish
Green.png.6489044bef4fdb38890ff386e44c049a.png

Blue much further, 1.8?
blue.png.a162b6d0115bfb79286420d0298644ce.png

Twiddle to taste, or get close then use HSL to nail it
done.png.e82b94f7022f1dfc478e671c1654e456.png

---Or---

You can use recolour to tint it, then HSL again to fine tune:
recolour.png.2ba362476e592b597b8b3b19d0ea0ae9.png

 

Hope that helps 🙂

Hi Alex, thanks again but it still remains greyscale when I follow your method and I make those adjustments in R, G and B.  I'm using the stacked TIF file from AS!2.

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In Ps I false-coloured the sun by 1) converting from greyscale to RGB and 2) going into curves to shape each colour's curve by hand to give the colouration I was looking for. Curves gives you more control than levels, which is locked into a logarithmic stretch. I just saved this as an action making it it a one-click job thereafter, though some images needed mild tweaks after the action.

If AP has Curves then that should work. If it doesn't, go back to Photoshop!!!  :D

Olly

PS Using Curves let me produce a colouration which went from a deeper orange at lower brightness to a yellower orange for the bright parts.

Edited by ollypenrice
clarification
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40 minutes ago, ollypenrice said:

If AP has Curves then that should work

Indeed it does, so that is another way👍

I tend to use Curves to do it if I'm using PixInsight, but levels in PS or AP?! I don't have a reason for doing it that way, so I'll have to try out your method, Olly!

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Hi both, I was looking for the profile conversion as I recall doing that in PS, so thanks again.  I've quickly done a full disk test with Alex's method but I am familiar with the curves suggestion from Olly so will try that too.  Many thanks, Chris.

646962678_Fulldiskcolour.jpg.2643bf0e69642c1641575cd5843dcd57.jpg

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1 hour ago, Owmuchonomy said:

Hi both, I was looking for the profile conversion as I recall doing that in PS, so thanks again.  I've quickly done a full disk test with Alex's method but I am familiar with the curves suggestion from Olly so will try that too.  Many thanks, Chris.

646962678_Fulldiskcolour.jpg.2643bf0e69642c1641575cd5843dcd57.jpg

Nice, but the whole image is surely brighter than it needs to be? Both the disk and the background could be darker so that's an easy one.

If you shape the curves carefully you can also reduce the redness of the background. I don't think there's an easy way to do that in Levels without black clipping. (Could be wrong about that, though.)

Olly

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15 hours ago, Owmuchonomy said:

Hi both, I was looking for the profile conversion as I recall doing that in PS, so thanks again.  I've quickly done a full disk test with Alex's method but I am familiar with the curves suggestion from Olly so will try that too.  Many thanks, Chris.

646962678_Fulldiskcolour.jpg.2643bf0e69642c1641575cd5843dcd57.jpg

Colour success! Glad we could get to the bottom of it 🙂

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