How to get picture with higher resolution

[PiotrG]

I am trying to find how to get a printable picture of what I will do with FreeCAD and can't find.
I don't need a high quality rendering. What I see in 3D window (when changed background to be white) is OK except I'd like to have a 600dpi A4 picture. Getting screen-shot and making it a little smaller I can reach about 100dpi. I don't know how to cheat FC to think the monitor is 6x bigger.

It looks that the only solution is rendering. So even didn't planned it I installed PovRay and Luxrender.
I am working with Windows 7.

With PovRay I didn't found povray.exe to point to it (as I read somewhere I should) so I pointed in configuration the POV-Ray\v3.7\pvengine.exe.
When I try rendering and it asks for output file I navigate to main directory D:\ and press two times letter a and Enter. Then I get the window telling what it is trying to do. I noticed that when I move the window position its text changes and I add the screen-shot of it.
From line 3 I understand that D:\aa.bmp file will be created but from text at bottom I understand that it can't open D:\aa.bmp.png.
I have never noticed any problems with file accessing at D:\. Sometimes Windows has something against accessing files in C:\Program Files (Windows things it is his own directory I think).
Do you know what is wrong.

With Luxrender I get the result as in next attached file. I don't know why it uses different color than I have set for my element. It looks that when I have set a camera position the background also was rotated (I assumed that I rotate only my element) and that it also ignores that I have set a white background (I wont to print at paper only the element and not its shadows). How to make a background white? How to get a bitmap output?

If it is possible to get higher resolution like screen-shot form 3D view then I am not asking about renderers. If it is not possible then do you know how to solve my problems with renderers. I don't need both. Let at least one work to give me high resolution (not high quality) output.

[openBrain]

Tools -> Save picture ?

EDIT : 'Extended' button on bottom of the dialog give you access to resolution parameters.

[kisolre]

The "!!! 10000x10000" there actually sets 1x1 size. Setting 10000x1000 by hand works

[PiotrG]

Tools -> Save picture ?

Tried, but "Cannot save null Image" even if I select in tree the part I wont to be printed.
So I went to Image Workbench. It has only 3 buttons. I have tried it a week ago, but couldn't find how I can add to tree the image of my element to later Tools-> Save. It looks for me that Image WB is to read the bitmap files into FC document but don't know for what.
First two buttons ask me to select a file (I understand that to be loaded - it is not what I wont). The third button I can select two points by clicking (don't know their minings), I can enter a distance, but wherever I click I can't step over Select ImagePlane. I just wont the same as I have in 3D view but clicking in it (its backround) don't allow to step over that question. So I suppose that I should someway add the ImagePlane to tree view. But how? Then after adding I probably need some way to place and position the element in that view. Why it just can't be the same as in 3D view.
Having not success with Image WB I tried Drawing WB and it is enough clear for me. Then few days later I start to read about rendering and really forgot those experiments with trying to have an image to be saved.
So I suppose what I don't know is how to add the Image and how to tell FC what should be at that image. Than probably Tools -> Save picture will work.

[openBrain]

Tools -> Save picture ?

Tried, but "Cannot save null Image" even if I select in tree the part I wont to be printed.

This is basically due to bad compatibility between Qt5 and Intel GFX drivers.
Best solution is to upgrade your FreeCAD to a recent build with Qt5.12 (this version solved a lot of GFX issues).
Another solution is to use a Qt4 version of FreeCAD but this isn't sustainable as Qt4 is obsolete.

[wmayer]

The "!!! 10000x10000" there actually sets 1x1 size. Setting 10000x1000 by hand works

git commit 84229b430

[PiotrG]

bad compatibility between Qt5 and Intel GFX drivers.

For me 2 new TLS-es (Three Letter Shortcuts)
So I understand that my idea that I probably need to add Image to tree-view is wrong. I need not to do it.

Best solution is to upgrade your FreeCAD to a recent build with Qt5.12

I suspect it means one of two files:
https://github.com/FreeCAD/FreeCAD/rele ... g/0.19_pre
but what is the difference between Conda and LP_12.1.2? Which one is better choice?
No one word about it in explanation before file lists.

[wmayer]

For me 2 new TLS-es (Three Letter Shortcuts)

Qt is the GUI toolkit used by FreeCAD. In version 5 it has reworked its usage of the OpenGL API.

but what is the difference between Conda and LP_12.1.2? Which one is better choice?

I assume it doesn't matter.

Once you have downloaded and installed v0.19 you go to Tools > Save picture and click the Extend button. There you have many options like setting the image size and now you can also select the offscreen rendering method:
Offscreen (new) -- uses Qt's offscreen rendering facility
Offscreen (old) -- uses the offscreen rendering function of the scene graph library (Coin3d)
Framebuffer (custom) -- uses a somewhat different API of Qt
Framebuffer (as is) -- reads the content directly from the graphic card

[PiotrG]

Once you have downloaded and installed v0.19 you go to Tools > Save picture and click the Extend button.

Thanks. Will try.
But today didn't found a moment for it (21:00 is coming - time to go home and not do experiments )

[PiotrG]

installed v0.19

Ok. It works. And even when exporting to pdf I don't get empty page as previously but ....
When I try to Export I get a question to select what to export.
If I select it, it is exported but not with original colors but with colors of selection (I've got everything lite-green).

Is there a way to Export to pdf with right colors or not (not 0.19 yet)?