I have some questions related to the use of Photoshop for the preparation of images for projectors and presentations.
I've noticed lately that most presentations I seem to attend are presented with images in widescreen format (16:9). I have found some higher resolution projectors available in widescreen format but have some questions.
In case I create my slides with a size of 1920 x 1080, do I need to adjust anything in Photoshop for this ? Using basic mathematics I would imagine that no adjustments would be necessary. After all 1920 x 1080 amounts to a perfect relationship of 16:9. Is this correct ? Should I expect that images projected by a projector with this aspect ratio will contain square pixels and no adjustments are necessary in Photoshop ?
Is there any situation where a pixel is project as a rectangle instead of a square and adjustments to accomodate this need to be made in Photoshop ?
Thank you in advance.
Will these images be presented via Powerpoint? Eitherway, nowadays it makes most sense to produce a high res 'Master' copy of your presentation. In the Slide show tab of Powerpoint there is an option to set the resolution, so if outputing to a 1024x768 (XGA) projector, you can set that accordingly, although the projector and your computer are probably going to sort that out between them automatically. I recently had to circulate a 1080p promo to a number of people, and just left it at full 1080. It worked fine on their 4:3 XGA projectors, and kept its 19:9 aspect ratio, albiet with dark bands above and below.
Decent projectors will let you adjust aspect ratios so you don't have overspill. I currently have an XGA projector which belongs to the camera club; a 1080, 2500 lumen projector that belongs to me, and a kick arse NZ$20,000 1920x1200 5000 lumen projector that I have to evaluate for a big convention for which I am the technical officer. The last two projectors are both controlable regards aspect ratio to avoid overspill. The last one is also so powerul that we used in a big room a couple of weeks back, and it still had amazing contrast with half the room lights on!