[Solved-Lazpaint] Possible to draw a thin and sharp line, at the first attempt?

[devEric69]

Hello,

I would like to draw lines - as thin and sharp as possible, without anti-aliasing - on their own layer, at the first attempt.

In the attached screenshot, when drawing a line with the polylines tool, I get the result on the left. Is it possible to get a line like the one on the right in the attached screenshot, i.e. without anti-aliasing, sharp, at the first try?

ps1: I've seen, that the tool Pen is associated with a tool-button "Disable antialiasing". But I have the impression that this option is not kept when drawing the line.
ps2: the pen colour of the line (result on the left, in the attached screenshot) is black, "solid=255", opacity=255".

[Thaddy]

property TCanvas.AntiAliasingMode := amOn.

Note this will slow down painting a bit, but it should improve the drawing considerably.

Drawing "sharp" lines - it tricks the eyes - without ant-aliasing is not possible, except pure horizontal and vertical.

What you see in your example is called "aliasing" and can only be solved by applying an anti-aliasing filter.

Note that on very high resolution monitors (4K+) you might get away with it without applying anti-aliasing filters.
On my full HD montors I still need to apply it.

Also note that not every anti-aliasing filter is the same, there are many different filter algorithms and I don't know which one TCanvas uses.
Have to look that up. I expect one of the simpler ones, for speed reasons.

[devEric69]

Also note that not every anti-aliasing filter is the same, there are many different filter algorithms and I don't know which one TCanvas uses.
Have to look that up. I expect one of the simpler ones, for speed reasons.

I would like to clarify that I am drawing with the compiled Lazpaint tool (end-user), i.e. I am not programming. So, I must probably use a filter to set \ emulate TCanvas.AntiAliasingMode := amOn in Lazpaint, when drawing with the poly-lines tool, if it's necessary. I don't know much about filters. Any advice on the best way to do this (after having drawn the line), would suit me.

[devEric69]

I've found the menu Filter \ Sharpen.

[Handoko]

Not sure about LazPaint but usually you can make semitransparent pixels to (nearly) full opaque on most graphics editing software by duplicating that layer several times. Maybe 6 times or more. Then you may want to merge all the duplicated layers for easy handling.

[devEric69]

No problem: in fact, AFAIK, the simplest would be that I should code and propose - via a Github query - the option to record the presence or not of an anti-aliasing, associated with the pen used to draw with the poly-lines or curves tool (question of free time, like everyone else).

[circular]

Hello @devEric69

It is correct that there is no aliasing mode for shapes, at least for now.

"Filter > Sharpen" will make it closer to that, yet not exactly. Duplicating the layer will work but tend to make things bolder.

You can emulate alpha aliasing by using "Filter > Apply function" and define alpha as "if(alpha>0.5,1,0)".

If you're interested in contributing to LazPaint you are welcome. The simpler is indeed to fork dev-lazpaint and do a pull request on GitHub.

[devEric69]

define alpha as "if(alpha>0.5,1,0)".

I've tested the tip `alpha(0..1) = "if(alpha>0.5,1,0)"` ==> it works.
Thank you for your help.

[circular]

My pleasure 

[devEric69]

I am a happy user who discovered an ultra-functional drawing and painting project .

[circular]

So happy to hear that