topic Re: Render brightness issue in AutoCAD Forum

Render brightness issue

marcoPNQPT — Wed, 10 Oct 2018 13:40:02 GMT

I have printed several drawings with realistic rendering to pdf.

They look fine on pdf but when I go to plot to paper it comes out too dark.

Is there a global setting that I can tweak to increase the brightness of these rendered images?

The materials color is already set to white but depending on the direction from which the objects are viewed, the resulting shaded face can turn out to be quite dark. I am not used to set up custom lights and it feels like it would take quite sometimes to do that on each separate drawing that I need to modify. But I can open each drawing and turn up the brightness and re-print... if there is such an easy control.

I have already set the "Hilightintensity" to 100 for the Realistic Visual Style.

Thank you,

Marco

Re: Render brightness issue

Alfred.NESWADBA — Wed, 10 Oct 2018 21:35:27 GMT

Hi,

>> They look fine on pdf but when I go to plot to paper it

>> comes out too dark.

When you plot the PDF or when you plot from AutoCAD?

If not please try to plot the PDF and compare the results on display with the one on paper, maybe it's the simple reason that your display is showing to bright.

- alfred -

Re: Render brightness issue

marcoPNQPT — Thu, 11 Oct 2018 08:25:26 GMT

Hi Alfred,

thank you for replying. The brightness on my screen is set very low. But I see now that plotting with another printer gives better results. The same whether I print directly from Autocad or from PDF.

I guess I need to find the settings of the specific printer.

It would still be interesting to know if there is a way to adjust the brightness of the render on Autocad.

Re: Render brightness issue

Alfred.NESWADBA — Thu, 11 Oct 2018 08:37:13 GMT

Hi,

>> It would still be interesting to know if there is a way

>> to adjust the brightness of the render on Autocad.

For the previous issue, adjusting the brightness for the printer would result in a too bright image on the screen

For render settings we first need to know the version of AutoCAD you are using as rendering changed a lot in the latest versions of AutoCAD.

- alfred -

Re: Render brightness issue

marcoPNQPT — Thu, 11 Oct 2018 08:42:36 GMT

I'm using Autocad 2017.
I don't use the ribbon, I still like the legacy toolbars.

Re: Render brightness issue

Alfred.NESWADBA — Thu, 11 Oct 2018 08:56:28 GMT

Hi,

>> I'm using Autocad 2017

Try command _RENDEREXPOSER, there you can set the exposure as well as the white balance, I guess that is the best way to adjust the global brightness of a rendered output without playing with light sources.

Just to make sure ... this setting only effects the rendered output, not the visual style within AutoCAD display.

>> I don't use the ribbon, I still like the legacy toolbars.

Then you'll miss a lot for render settings ...

- alfred -

Re: Render brightness issue

marcoPNQPT — Thu, 11 Oct 2018 09:51:36 GMT

Thank you, this offers some potential for future use. Unfortunately it
doesn't work with my specific set-up. My viewports' Shade Plot style is set
to Realistic. _RENDEREXPOSER doesn't effect the existing viewports. If I
go into each individual viewport and change the settings via
_RENDEREXPOSER and
then set Shade Plot to "As Displayed" then I can see the difference in the
print-out.
Except for the fact that this is a bit laborious, there are two problems:
1. the plotted background turns black. If I set the background to white, it
is always white also on my screen, which is quite bright to work with (I
normally have all my background to black in both model and layout space).
2. Once that a viewport is set with _RENDEREXPOSER , it behaves in strange
ways when zooming in and out. It doesn't update dynamically so that the
scale doesn't display properly.

Re: Render brightness issue

Alfred.NESWADBA — Thu, 11 Oct 2018 12:18:41 GMT

Hi,

>> _RENDEREXPOSER doesn't effect the existing viewports.

Sorry, we were speaking about "render" results, not visual style based displays (as I wrote before).

If you don't want the viewport to be rendered then you can only use visual style settings and display background to influence the brightness.

- alfred -

Re: Render brightness issue

marcoPNQPT — Thu, 11 Oct 2018 13:18:36 GMT

Apologies for the confusion.
So I guess there is no global setting to change the brightness of the
visual style based displays, other than the "Hilightintensity" for the
Realistic Visual Style, which is already set to 100?

Re: Render brightness issue

Alfred.NESWADBA — Thu, 11 Oct 2018 13:27:32 GMT

Hi,

sorry, I don't know any other setting for that.

- alfred -