Bye-Bye Blue Sky

The Twilight Render Team shares tips, ideas, helpful hints, and more on using Twilight Render
Post Reply
Fletch
Posts: 11711
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2016-2021
Contact:

Bye-Bye Blue Sky

Post by Fletch » Sat Apr 03, 2010 12:46 pm

"What is this blueish color result on my rendering?"
well, it's from the blue sky 'shining' onto your model... but it could stand improvement.

It is recommended to get rid of this quickly and easily in post-pro by using the white point feature in your image editor... takes only a few seconds
Choose pull-down menu in Photoshop, for instance, Image>Adjustments>Levels then choose the "white" eyedropper and click a point on a surface in the scene that is supposed to be white.

But another tip for users of Photoshop (or perhaps Gimp?), that works very nice and perhaps other editors have this features as well, is to use a photo filter to eliminate it in about 5 seconds.
This author set up an automatic action in Photoshop so that it can be done instantaneously at the press of the play button.

Create a photo filter layer over the top of your image as shown below.
  1. Use Warming Filter
  2. Set the color to RGB 100,100,80
  3. Set the layer opacity between 35 and 50 depending on how strong of a blue removal you desire.
  4. Couple this with using the recommended sky template here, and your blues will be gone in no time. :D
Attachments
ByeByeBlue.jpg
ByeByeBlue.jpg (207.86 KiB) Viewed 8917 times

Fletch
Posts: 11711
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2016-2021
Contact:

Re: Bye-Bye Blue Sky

Post by Fletch » Wed May 05, 2010 7:58 am

Using Picasa (fantastic free image editor from Google) to achieve same effect in 3 clicks:

Use Picasa to view the image, then follow the steps shown:
  1. Effects Tab
  2. Warmify
  3. Glow (adjust top slider as desired)
Then, of course, do a "Save-As" of the image.

Also nice is:
  1. Effects Tab
  2. Warmify
  3. One-click-color fix button
  4. Glow (adjust top slider as desired)
Attachments
Picasa-Warmify-Glow.jpg
Picasa-Warmify-Glow.jpg (45.9 KiB) Viewed 8614 times
Glow-Slider.jpg
Glow-Slider.jpg (16.81 KiB) Viewed 8548 times
Picasa-One-ClickFixColor.jpg
Picasa-One-ClickFixColor.jpg (18.71 KiB) Viewed 8545 times

JGA
Posts: 206
Joined: Fri Aug 28, 2009 12:13 pm
OS: win7 pro 64 bit
SketchUp: 2015 pro

Re: Bye-Bye Blue Sky

Post by JGA » Tue May 11, 2010 1:23 pm

Thanks for these tips, they help make a more professional image.
I never thought of Picasa, but it works well for a free package.
My "proper" image editor is Corel Photo-Paint. I'll need to figure out how to adjust the colour balance properly, as it tends to be a bit hit 'n miss at the moment.
JGA

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests