Any time you want to reproduce (print) an image it would be a good idea to use a high resolution file. Have you ever tried to print out an image that is off the internet? Most of those images are only 72dpi. They look fine on your monitor where your eye fills in the bumpy parts, but just try printing them out at least 6 inches wide and... yuck!
1080p is the resolution that should be used for a proector, because 720p in a prjojector would produce poorer image quality in a large size and would be overpriced as compared to 720p television.
Photoshop is a commonly used professional image editing software. I would recommend this.
I would strongly recommend you upgrade to the newest version out which is Photoshop CS5 if you can.And it's Adobe Photoshop CS2. You wont find any answers typing CSS2.
Illustrator is a vector based program. Photoshop is well... for photos mainly. I've used both hand in hand to create awesome graphics utilizing the 3D capabilities in Illustrator. Vector graphics are basically line drawings that can be used at any size without distorting resolution as would happen in Photoshop.
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Adobe Photoshop would be great for editiing and printing photos, but you may want to consider Adobe Photoshop Elements.
Having used both (and both are very good), I can tell you that Photoshop, although trickier to master, is superior in features, and is the choice most professionals would go for.
The only version of Photoshop that is free is the trial, you would need to sign up for that on the Adobe website. Look for the related ink below. There will be a orange Joinbutton on the right side of the page, under the section Photoshop CC.Any free copies of Photoshop is more than likely illegal. If you would like great software, you must purchase it.
The resolution would worsen.
One would need Photoshop Lightroom to organize and store their photos. There are many other options and software which one could use. Photoshop Lightroom is a very popular software package highly rated by many consumers.
You can artificially increase the resolution of a jpeg image in Adobe Photoshop, but there will be a loss in quality because data is "invented" through a process called interpolation. A low resolution image only contains X amount of data, and to increase its resolution, you are telling the computer software to add nonexistent data to the picture file. This is generally ok if you're only increasing the resolution by 10% for general print purposes, but to make a dramatic increase in resolution such as 72 dpi to 300 dpi, the image will most likely artifact (pixelate).The best and obvious solution would be to acquire the original image.