Putting vector image onto graph

ROOT
1

Hello,

I’d like to put a logo image onto a histogram. I have tried to use TImage and it works except it makes from my inserted EPS vector graphics a bitmap. Is there some way to keep the image in vector format? Perhaps to convert it to some ROOT vector drawing definition first or something like that?

Cheers,
Javi

2

Hi,
do you mean conversion EPS to ROOT graphical primitives?

Regards. Valeriy

3

Hi,
Rene just explained me your problem.

The resolution of image was changed because original image (tmva_logo.gif)
was scaled by factor of ~10.
An image can be saved in PS file only as an array of pixels.
There is no possibility to “extract” vector objects from an image.
I can only suggest you to try to draw tmva_logo with ROOT graphics primitives.

Regards. Valeriy

4

Yes, converting EPS to ROOT graphical primitives would be exactly what I need. Is it possible?

5

Hi,
for that a PostScript interpreter needed.
It is probably possible to create a “plugin” based on
Ghostscript interpreter pages.cs.wisc.edu/~ghost/
or some other one like cs.usfca.edu/~parrt/course/6 … cript.html
but even having it, ROOT graphics lack of some basic PostScript primitives,
e.g. bezier curves.

Regards. Valeriy

6

Valeriy,

TASIMage has already the logic to import from an eps file, ie converting from vector graphics to pixmap. This conversion (via libAfterImage) is certainly done using vector graphics too.

Rene