There are no specific recommendations for making slideshows but as it was said above there are some video montage’s details, that’s why some rules are used during videos and films making.
Let’s consider the most typical case when you need to make a comfortable view slideshow that may make perception of photos better. Taking this into account, you should take care about spectators first — shots’ changing do not have to be abrupt and shots have to be suitable for each other. Watching slideshows means not to feel discomfort. To please this requirement is to pay attention to some clauses.
At first, the order of photos should not have photos with objects the same size near each other. For instance, if you added a photo where a man’s portrait is depicted, then the following shot should contain a man depicted by common background way — e.g. waist-deep or full length. This concept is known like “size” and it is defined with a relative person’s size. As a rule, an individual portrait is called close-up, a person who is depicted waist-deep and full length is called middle distance, and a depiction of a group of people is an overall plan.
It is said that plans’ alternation has to follow the next rule: neighboring shots that are the same size cannot be one after another. In other words, an overall plan does not have to be near bigger or overall one. The best “neighbor” for this shot is a middle distance that does not have to be after a middle one too.
A photo’s size is a parameter that is difficult to change after photographing. Beside order’s changing, there are some instruments available for the photographer. For example, framing. It is a convenient instrument to use. Framing is presented almost everywhere in editing software. Its idea is to allow user to distinguish a necessary area and cut off an extra part of a photo. Thereby you can simply make a middle or large shot from an overall plan.
Framing is just the same as a photographing with a long-focus lens. There is the only disadvantage — a photo resolution lowers. But all about this is not too bad: modern cameras let get shots in HD quality that greatly exceeds video devices’ resolution. To compare with, a modern TV’s resolution or FullHD monitor is a little bit more than 2 megapixels and the same time the most inexpensive and simple modern camera has a resolution of 12 megapixels.
However you should notice that this rule is not very strict and as all the rules is relative enough. But if you follow it you will definitely raise the quality and showiness of your photos even if your experience is not big.
The next rule is a compatibility of neighboring shots taking into account their colors and illumination. Here you will not be “banned” if your photos are not different about exposition and of course, are not different about color saturation or shades. If the photos are made and organized by a good photographer then they can be compared with a good cameraman’s and a color corrector’s work. In that case while watching a slideshow a spectator will muse about integrity of videos and an abrupt changing of plans will not divert him from watching a slideshow.
If an author is doubt about photos’ integrity, he should not be lazy and spend some time on work in every editing software to provide a uniform brightness, contrast and color parameters of images. Very convenient and useful instruments are basic instruments of such a popular program as “Photoshop”: “curve”, “exposure”, “photo filter”, “levels” etc. Furthermore, a minimum filter let you correct flaws of an exposure and a composition, just do all that is called as photos’ technical retouch.
The third basic rule belongs to a demonstration’s duration. It’s simple enough to use middle distances not less than 3 sec. Taking into account some specificity of original photo’s quality, this time interval should be enlarged till 4-6 sec. In fact, photo’s specification is high enough and is often a completed product that is aimed to whole information in itself. A spectator requires some more time to realize all the information. The passages’ time is recommended to be considered apart.
In general, during making slideshows and images’ preparation an author should remember that the main aim is to impress a spectator, give him only the positive emotions and let him get satisfaction from watching a product. All in all, emotions are an aim of every art.