Affinity + MainTop RIP without pain: Spot Channel Builder, i.e. spot channel from a layer

If you work in Affinity and prepare files for print, you probably know this moment: everything looks good in the project, you export PDF or TIFF, drop it into RIP (e.g. MainTop)… and the spot/spot color channel is not recognized as it should be. Instead of “W1” (white underbase) or varnish, you get a regular image or something the RIP interprets differently.

And then the workarounds begin: hacks, manual fixes, blind tests, repeated exports. This is exactly why Spot Channel Builder was created. A small program that, for many users, is simply a game changer in the Affinity -> MainTop -> RIP workflow.

Why are Affinity and spot channels often a problem?

In practice, the point is simple: in a DTF/UV/production print workflow, RIP must receive a file where the spot channel is saved in a way the tool understands. In many cases (including MainTop), the key points are:

• correct creation of the spot channel,
• correct channel name (e.g. W1 for white underbase),
• and the output file format (often RIP-ready TIFF is best).

In Photoshop this can be handled in the classic way via spot channels. In Affinity this is practically impossible - not because Affinity is “weak,” but because a typical RIP workflow requires a specific way of storing spot data.

Spot Channel Builder - what is it?

Spot Channel Builder is a program that:

• takes your PDF or TIFF,
• finds the layer with the name required by RIP (e.g. W1),
• creates a spot/spot color channel from it,
• and saves a ready TIFF for RIP that MainTop and other tools can correctly recognize.

It also has a useful bonus that can save you in a crisis:

Smart fallback: if there is no W1 layer, the program still works

If there is no layer with a given name (e.g. W1), Spot Channel Builder can automatically create a spot channel directly from the image (currently without thresholding).
This means: even if you forget to prepare the underbase as a separate layer, you can still quickly generate a file or deliver production in emergency mode.

Most common use cases: white underbase and varnish

In practice, spot channels are most often used for:

• white underbase (for printing on dark materials),
• varnish (e.g. selective varnish),
• other masks required by RIP.

In Spot Channel Builder you can:

• set the spot channel name (if your RIP requires a name other than W1),
• invert the mask (Invert Mask),
• change DPI,
• and generate a RIP-ready TIFF with one click.

Step-by-step tutorial: Affinity -> MainTop -> RIP

This is the simplest workflow:

1. In Affinity: create a layer for underbase/varnish and name it exactly as your RIP requires (e.g. W1 for MainTop).
   
2. Export the file as PDF or TIFF.
3. Open the file in Spot Channel Builder.
4. Set options (DPI / spot name / invert).
5. Click Build TIFF for RIP.
   
6. You get a ready TIFF file in the format: your_file_spot_name.tiff

And you can load it into RIP. That’s it. You no longer need to buy a Photoshop license only to add spot color.

Why is this a game changer?

Because it saves time and removes risk.

1. Fewer trial-and-error tests

   You don’t need to make 10 exports and check whether “RIP finally sees it.”

2. The “Affinity spot channel / spot color” problem is gone

   You get a simple way to create spot channels for MainTop and other RIPs, without jumping between programs.

3. This is a production tool

   You get one concrete button: build TIFF for RIP and done.

4. It also works in emergency mode

   No W1 layer? The program can build a spot channel from the image.

Download and license (simple)

You can download the program for free here: Spot Channel Builder

For activation and full use you need a license. The license is very affordable, for one device, lifetime, assigned to one e-mail. You receive the license number by e-mail (usually immediately, max 24h).

Who is Spot Channel Builder for?

Spot Channel Builder is for people who use Affinity, do not want to pay for Photoshop, and need a spot channel for their RIP software. For print shops, wall printing, UV printing, DTF, and more.
Highly recommended!