Greyscale > b/w

[Arp_148]

How do I take out all grey color so I only have black and white left? aim is to make black lines pop while deleting surrounding greyscales, thanks

[lepr]

Threshold Adjustment

[Arp_148]

Thanks ! perhaps you also know how to apply distort>shear on multiple layers? 

[Arp_148]

3 minutes ago, Arp_148 said:

Thanks ! perhaps you also know how to apply distort>shear on multiple layers? 

found it, thanks

[lepr]

I would use the bounding box side handles or Transform panel to perform a shear, rather than the Shear filter.

[Arp_148]

Issue though: it wont apply to all layers. If I however delete a text layer inside one of the layers, it does indeed work on that layers are well. I wonder how to get the text included though 🤔 

[walt.farrell]

29 minutes ago, Arp_148 said:

I wonder how to get the text included though 🤔

Group the layers, and shear the group? (Or just select all the layers in the Layers panel, which will give the same effect.)

(Without seeing your document (or a screenshot including the Layers panel) I'm only guessing.

[John Rostron]

3 hours ago, anon2 said:

Threshold Adjustment

Yes, but bear in mind that this will not produce a true 1-bit black and white image. If you look at the histogram after applying the Threshold Adjustment, then you still have grey pixels present. I would guess that these are from anti-aliasing the true black and white.

John

[lepr]

1 minute ago, John Rostron said:

Yes, but bear in mind that this will not produce a true 1-bit black and white image. If you look at the histogram after applying the Threshold Adjustment, then you still have grey pixels present. I would guess that these are from anti-aliasing the true black and white.

John

Of course it won't produce a 1-bit image; Affinity apps don't support that. However, it does produce pure black and white with no intermediate greys.

[John Rostron]

7 minutes ago, anon2 said:

Of course it won't produce a 1-bit image; Affinity apps don't support that. However, it does produce pure black and white with no intermediate greys.

Then where do the intermediate (grey) pixels come from in the histogram?

John

[lepr]

1 minute ago, John Rostron said:

Then where do the intermediate (grey) pixels come from in the histogram?

John

I wouldn't trust the coarse histogram. Click the exclamation mark at top right of it to generate a full resolution histogram.

[Arp_148]

Also I wonder if its possible to skew multiple layers equaly in publisher or designer? just realized I need linked files in each skewed layer to be able to update the skewed layers now, and then photo is not the way to go I guess. 

[JimmyJack]

7 hours ago, John Rostron said:

Then where do the intermediate (grey) pixels come from in the histogram?

John

Hi John. I'm not getting any intermediate grey pixels.
Care to share a screen grab of your Histogram (and layers)?
(first guess (if you're seeing just a few peaks along the way) is that you might not be pixel perfect and the extra greys are the antialiasing along edges that are being smeared? ...Or the antialiasing of an object without straight edges.)

Aha! Or maybe this...

Non-rectangular object:
Nested Threshold vs in-line Threshold.

[walt.farrell]

1 hour ago, Arp_148 said:

Also I wonder if its possible to skew multiple layers equaly in publisher or designer? just realized I need linked files in each skewed layer to be able to update the skewed layers now, and then photo is not the way to go I guess. 

As I suggested for your question about text, perhaps it would work for you to select each of the layers in the Layers panel. You can then skew their common bounding box using the Move Tool and the bounding box  handles. Or you can skew using the Transform panel.

You also have the option of selecting the "transform objects separately" icon on the Context Toolbar.

[John Rostron]

On 8/20/2020 at 6:43 PM, anon2 said:

I wouldn't trust the coarse histogram. Click the exclamation mark at top right of it to generate a full resolution histogram.

You are right. Clicking the exclamation mark reveals a pure black and white histogram.the pure black-and-white is also there when I save as PNG/8 and re-load. No sign of any anti-aliasing.

John