blend ranges / anti-aliasing / info panel issues

[NotMyFault]

Hi,

there are some strange things going on.

I have a test document with a colored rectangle shape, rotated 45°, to create an edge which becomes anti-aliased by default.

Windows 10, OpenCL deactivated to cut out any issues from that area.

1. When zooming in >=100% to spot individual pixels, the info panel does not show the exact pixel colors of anti-aliased pixels. It kind of lags behind and shows 0% or 100% alpha for pixels who are actually 4% or 75% alpha.
2. The blend range / anti-aliasing coverage map will result in a totally different rendering if you add a node on the existing curve, without changing the curve. This too is unexpected.

I've added a video to demonstrate these issues. Sorry for bad audio.

 

2021-04-21 19-20-51.mkv

[Lee D]

Can you check the short screen recording* I've attached to see if anything is different with regards to the Info panel or the workflow.

I'm using Affinity Photo 1.9.2 on Windows 10 (OpenCL disabled), starting a new document with transparent background. Inserted a shape with a fill (R=255, G=0, B=0) and rotated 45 degrees and zoomed in

*screen recording has some audio applied by capture app, may want to play without.

I'm confirming if the behaviour of adding a node to the blend range is expected or not and will update. But not being able to use the cursor with the Info panel while that UI is open is expected.

[NotMyFault]

Hi Lee,

i have a new document better showing the issue:

For a curve, the info panel does not show correct info for partially transparent pixels (upper green line)

Only for the rasterized copy, you get the correct info (lower green line).

 

2021-05-14 18-35-08.mkv info panel for curves.afphoto

[NotMyFault]

Hi @Lee D,

 

i tried if the current beta shows different results, only to find  a new issue regarding nested PT filters

 

[Lee D]

On 5/14/2021 at 5:39 PM, NotMyFault said:

Hi Lee,

i have a new document better showing the issue:

For a curve, the info panel does not show correct info for partially transparent pixels (upper green line)

Only for the rasterized copy, you get the correct info (lower green line).

 

2021-05-14 18-35-08.mkv 23.52 MB · 0 downloads info panel for curves.afphoto 41.55 kB · 0 downloads

The attached is your file open on my system and both the Curve and Pixel information seems to be detected and displayed on the Info panel. Check that when using that you don't have a single object selected on the Layers panel.

720.mov

[lepr]

15 minutes ago, Lee D said:

The attached is your file open on my system [...]

 

Your video shows the OP's problem #1.

 

[lacerto]

(...)

[NotMyFault]

Hi @Lee D

As several other users confirmed the findings, i would really like Affinity to have a second look.

To add another inconsistency, at least with official help files:

According to help (in Photo, topic "Layer blend ranges"):

1. This sentence cannot be found in the online version of the same topic (https://affinity.help/photo/English.lproj/pages/Layers/layerBlendRanges.html)

2. This does not works as described:

Flat line on top shows anti-aliasing (discrepancy to help file):

Whereas flat line on bottom stops anti-aliasing:

3. If you set anti-aliasing to "forced off", it stays active.

 

coverage map isse 2.afphoto

[R C-R]

4 hours ago, NotMyFault said:

Whereas flat line on bottom stops anti-aliasing:

Hmmm. I only tested with a rotated rectangle & a rotated rectangle converted to curves, but for me a flat line at either the top or the bottom of the coverage map stops anti-aliasing.

curve aa off.afphoto

[NotMyFault]

What happens when you rasterize, then again rotate, and try to stop anti-aliasing? this again completely fails on Windows.

[R C-R]

8 minutes ago, NotMyFault said:

Could be classical Win / Mac difference

So it is not working as I described for you in the file I posted?

[NotMyFault]

Not really:

bottom line:

top line in 1.9.2.1035 looks ok:

 

But when you rasterize (clean shape), rotate and try again it fails:

[lacerto]

(...)