success1975 wrote:
Hi Luis Sequeira1,
I tried, and it worked! I like the way how you have explained clearly, step by step. Thanks for your reply. As how you have mentioned about the white part inside characters like p,d,e,o, a,b,g - removing takes more time.
I am glad I could help :-)
You have also specified about "export directly to png with alpha channel (transparency)" to get good result - Is that I have to use photoshop for that? I don't have Photoshop installed in Mac. Is there any other way of doing the same.
Thank you.
I was not thinking about Photoshop.
Your image consists of symbols and text. Internally they are described as certain lines, curves, etc. - not as black or white pixels.
That is why when you open a pdf in Preview containing text you can zoom in 2000% and see perfectly drawn curves, not big square pixels.
There is a substantial difference between "vector" graphics (lines and curves described mathematically are stored in the file) and "bitmap" graphics (the color and opacity of each pixel is stored in the file).
All graphics eventually have to be converted to pixels to be shown onscreen or printed. This is called rendering.
When you work with preview the way I described, you take an already bitmapped version of the image, and let Preview calculate with the colors of the pixels to determine what to make transparent.
If the image were vectorial the software could work with the mathematical description of the lines composing the image and render directly to produce the end result with transparency. That is what LaTeXit does.
Don't worry too much about this. The difference may in many cases not be very noticeable, and n particular, if you do the magic wand on a large version of the image.