convert grey scale image to bitmap

[Louise Lemieux Berube]

I just bought Affinity Photo. There is something I need to do (that I'm used to do with Photoshop) that I could not find, although I went through the book.

How can you convert a grey scale image into a bitmap AND have access to the halftone screen, frequency and choice of lines or dots?

chambre blanche bitmap300 invert.tif

[Fixx]

https://forum.affinity.serif.com/index.php?/search/&q=1-bit

AP does not support 1-bit bitmaps. It can though export as 1-bit indexed colour, (which may not help much as it is not true b&w bitmap).

And you cannot make true halftone screens, there are no tools for it. Possibly you can prepare fake halftone effect and adjust that with threshold effect and export to 1-bit... not too simple a process.

[Louise Lemieux Berube]

Thank you for replying so quickly. I am disappointed.

I will have to keep my Photoshop soft. -- my subscription for all the other software in the Adobe series will be cancelled at the end of this month... to expensive.

I am happy with Affinity Publisher... I found how to do everything I am used to do on Indesign.

thanks again

[MikeW]

Though the photography plan is a good value, consider downloading a trial version of PhotoLine. It's perpetual licensing and can do what you want.

[Louise Lemieux Berube]

thank you Mike. I downloaded PhotoLine. Was able to convert into a bitmap (easily). Now, could you help find the path to get into the halftone screen, in order to adjust frequency and choose between lines and dots? That would be so useful!!! Thanks in advance.

[MikeW]

Hi Louise,

For halftone dots, it's under the Effects | Special Tools | Rasterize. However, one can also do it with an Adjustment Layer, which is non-destructive. Found under Layer | New Adjustment Layer.

For other methods of halftoning (which I usually use), halftoning can be found under Layer | Convert Layer Type... Then choose To: Monotone and the Option for the method. I often use JJN Dither for photographic images. Be sure to view at 100% for an accurate view of the result.

[Louise Lemieux Berube]

thank you so much. You have been of great help. I will do more tests and compare with what I get with Photoshop. I think, at this moment, that Photoshop will no longer be necessary! Youppi!

Thanks again. Appreciate this very much.

Louise

[RKA]

@Fixx I can't - for the life of me - test the theory of exporting as 1-bit. The TIFF export is as close as it gets, but it's still only 8-bit.

I'm using 1.8.3

Thanks in advance. 

Reyka

[Fixx]

10 hours ago, RKA said:

@Fixx I can't - for the life of me - test the theory of exporting as 1-bit. The TIFF export is as close as it gets

TIFF export in AP does not do lower than 8-bit. If you want 1-bit export you have to use PNG or GIF. And there is some fundamental difference between 1-bit B&W and 1-bit Indexed so it may not behave as expected in layout  apps.

[lacerto]

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[Fixx]

4 hours ago, Lagarto said:

I am not sure what you mean by difference of 1-bit BW and 1-bit indexed.

...well, I think export options have been updated since I last checked 😄
Now you can select Black and White palette both is PNG and GIF and they both behave correctly in InDesign – i.e. you can colour background (white) and black pixels separately.

[lacerto]

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