Rotating canvas in GIMP

Gino D · **Joined:** Nov 06, 2012 **Posts:** 239 **Location:** Italy

I see it as a very handy tool that will enable the digital painter as well as the simple user to have a more complete perception of any drawing or photo, by providing an infinite number of viewing angles.

Thank you, K1TesseraEna, for letting us know about this upcoming feature.

K1TesseraEna · **Joined:** Sep 22, 2012 **Posts:** 2089 **Location:** US

Onkel Hatti wrote:

I use a graphic tablet. When I want to cutout a form, I have to draw a curve from right bottom to left top. Try it, it's hard for a right-handed. So I rotate the canvas, nothing of my content will change but I can rotate it in a way, that I can draw the same curve from left to right. Thats much easier. A very useful feature.

Hatti

That was the first thing I thought about. Making a selection with Free Select or
Scissors Select tool would be much easier and more accurate.
The Rotate tool in its current state makes me rotate my head :hehe

.
Due to the human eyes anatomy we are way better at sizing up and making perfect horizontal lines than vertical lines.
So I would not agree with dd saying that this feature isn't really useful in GIMP.

Gino D wrote:

I see it as a very handy tool that will enable the digital painter as well as the simple user to have a more complete perception of any drawing or photo, by providing an infinite number of viewing angles.

Thank you, K1TesseraEna, for letting us know about this upcoming feature.

You're welcome, Gino!
It's hard to disagree with you.
Any marvelous scripts of yours are currently in development?

Zeo · **Joined:** Apr 29, 2013 **Posts:** 203

K1TesseraEna · **Joined:** Sep 22, 2012 **Posts:** 2089 **Location:** US

Zeo wrote:

I'm not sure, but is this canvas rotation consume more memory or not?

Theoretically speaking, yes.
You can check it out right now with the panning function (mouse over canvas area, press and hold Spacebar and move mouse around).
I think canvas rotation will be implemented in a similar way as panning.

Carlos Diniz · **Joined:** Jan 20, 2013 **Posts:** 590

Thanks, K1TesseraEna. As always you help me in my troubles. I did not know what MMB was. You seem my guardian angel in GIMP.

Rod · **Joined:** May 16, 2010 **Posts:** 16170

I wonder if the rotating canvas will have a PDB.So it's parameters could be called for scripts.
That may be interesting.

Zeo · **Joined:** Apr 29, 2013 **Posts:** 203

K1TesseraEna · **Joined:** Sep 22, 2012 **Posts:** 2089 **Location:** US

Zeo wrote:

K1TesseraEna wrote:

Zeo wrote:

I'm not sure, but is this canvas rotation consume more memory or not?

Theoretically speaking, yes.
You can check it out right now with the panning function (mouse over canvas area, press and hold Spacebar and move mouse around).
I think canvas rotation will be implemented in a similar way as panning.

If I remember it right, Photoshop have this feature, but with somewhat with hardware support (never try it lol).
Yeah it seems using memory but not that big if compared with flipping or rotating. I think it is similiar with MyPaint on canvas rotation

You're correct Zeo. Latest version of MyPaint, Krita have this feature.
Not sure what you mean by hardware support - graphics acceleration utility or tablet support?

@Carlo Diniz You're welcome, Carlos!

Rod wrote:

I wonder if the rotating canvas will have a PDB.So it's parameters could be called for scripts.
That may be interesting.

I don't think it will be possible. Rotating canvas like zooming in/out or panning is a viewport manipulation
and does not change or create pixels.

Zeo · **Joined:** Apr 29, 2013 **Posts:** 203

K1TesseraEna · **Joined:** Sep 22, 2012 **Posts:** 2089 **Location:** US

Zeo wrote:

K1TesseraEna wrote:

You're correct Zeo. Latest version of MyPaint, Krita have this feature.
Not sure what you mean by hardware support - graphics acceleration utility or tablet support?

Something like OpenGL, I think it is hardware thingie, since to use this on canvas rotation in Photoshop must "contain a video driver or card that provides OpenGL acceleration:...

http://www.peachpit.com/articles/articl ... 4&seqNum=5
It's good knowing gimp can have this feature even without using hardware support.

Oh, see what you mean now. GIMP is only going to use OpenCL graphics acceleration software in not so distant future.
The choice of OpenCL seems logical since it sits well with GEGL once gimp is fully ported to it. This in turn will make possible GPU rendering.
Blender already has GPU-based render support for NVIDIA graphic cards and uses OpenGL that you mentioned.
OpenCL is inferior to OpenGL (or at least that's what I heard) in terms of computation time, but still better than nothing.
But right now there is no graphics acceleration support in GIMP.

RobA · **Joined:** Jul 14, 2010 **Posts:** 697

Rod wrote:

I wonder if the rotating canvas will have a PDB.So it's parameters could be called for scripts.
That may be interesting.

Highly unlikely, as it really is just a display rendering "filter", and does nothing to the image data itself.

-Rob A>