In their own ways, both programmes are great. Canva is designed for a crowd of non-designers, while Photoshop is a professional level program that can be used with some cool features for simple graphics design. If you're a complete newbie, Canva would probably be a better option for you with no design skills.
The format can easily handle high resolution photos thanks to PNGs' high color depth. Since it is a lossless web format, however, file sizes tend to get very big. For the screen, PNG graphics are optimized. You could definitely print a PNG, but with a JPEG (lossy) or a TIFF file, you'd be better off.
In printing, the most common way to achieve color is referred to as CMYK, four-color process, 4 / c process, or even just process. A file is separated into four different colors to reproduce a color image: Cyan (C), Magenta (M), Yellow (Y) and Black (K). The image of a color is separated into CMYK.
Today, average inkjet printers generally have a 1200 x 1440 dpi resolution. If you're not going to print photos larger than 5 x 7 inches, this is a good enough resolution.
When you don't have access to a local printer, FedEx-Kinkos is probably a pretty good bet. It is also just about $0.10 per page to print [black & white] on your own paper! Most office supply stores (Office Depot, Staples) sell certain quantities of paper, including coloured cardstock.
There is no need for online access to operate printers used to output documents from a computer. Provided that the document or file to be printed is stored on a local hard drive or on the local network, it can be printed without an Internet connection.
The earliest known form of printing applied to paper was woodblock printing, which appeared prior to 220 AD in China. Later developments in printing technology include the movable type invented by Bi Sheng around 1040 AD and the printing press invented by Johannes Gutenberg in the 15th century.
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