How to apply a color spectrum to an object?

[gumbo23]

I need to apply a color spectrum to an object - a pixel layer in this case. I am fine applying a chosen single color, but how would I apply a 'rainbow' effect to an object?

Being able to choose the gradations - whether color or greyscale would be useful.

Thanks

 

[Gremriel]

Have you tried the Fill Tool? It allows you to place stops and assign a different color to them.

[David in Яuislip]

If it's APhoto, use the gradient tool. Create colour stops where you need them and adjust the colours accordingly. I would practice with a Fill Layer as the effect stays live, with a Pixel Layer it's baked in and can't be changed. After you've made the gradient it can be added to the swatch panel, 

[gumbo23]

23 minutes ago, Gremriel said:

Have you tried the Fill Tool? It allows you to place stops and assign a different color to them.

I barely know the basics tbh, so do not know how to carry out the operation you describe. Can you lay out the steps? Thanks in advance

[gumbo23]

22 minutes ago, David in Яuislip said:

If it's APhoto, use the gradient tool. Create colour stops where you need them and adjust the colours accordingly. I would practice with a Fill Layer as the effect stays live, with a Pixel Layer it's baked in and can't be changed. After you've made the gradient it can be added to the swatch panel, 

It's a pixel layer, not a photo. So I can't make the adjustment?

[David in Яuislip]

3 minutes ago, gumbo23 said:

It's a pixel layer, not a photo. So I can't make the adjustment?

By APhoto I meant Affinity Photo, you didn't mention which program you're using. Have a look in the Help, it's quite comprehensive for gradients

[gumbo23]

2 minutes ago, David in Яuislip said:

By APhoto I meant Affinity Photo, you didn't mention which program you're using. Have a look in the Help, it's quite comprehensive for gradients

It in Photo. You mean the help on the men bar?

[walt.farrell]

8 minutes ago, gumbo23 said:

You mean the help on the men bar?

Or the online Help. https://affinity.help/photo/en-US.lproj/index.html
Just type gradient into the search box.

[gumbo23]

29 minutes ago, walt.farrell said:

Or the online Help. https://affinity.help/photo/en-US.lproj/index.html
Just type gradient into the search box.

Again - not having the basics down, I'm struggling to work through this. I've tried using the gradient tool and gradient maps, but they do not affect the object in question.

I have taken a jpg, erased white background, and been left with a background pixel layer, with my object. I cannot seem to affect the color of this object at all. How do I do this?

[gumbo23]

This is the file in question. I want to recolor the cloud with a gradient

Cloud stampe 4 ewp.afphoto

[David in Яuislip]

Create a gradient on a fill layer above the cloud then Arrange/Move inside

[Dazmondo77]

Looks like you have all the elements already in your document - here's a screen recording which will hopefully, help you 

Just to clarify you can use anything as a mask by just dragging it to right of the layer or group 

[gumbo23]

3 hours ago, Dazmondo77 said:

Looks like you have all the elements already in your document - here's a screen recording which will hopefully, help you 

Just to clarify you can use anything as a mask by just dragging it to right of the layer or group 

This is excellent - thanks so much. Between all you guys on the thread I got the job finished. Much appreciated