Typography
Typography is to do with the use of certain font for image or clarification, so the fixed limitation to a channel such as BBC One is that the presentation has to be kept the same, but this makes the ident seem boring. Although the channel presentation can be varied to a minimum there can be a few modifications for example BBC Two is all in capitals and bolder. It is good sometimes to keep the presentation consistent throughout, because the less change there is the more assurance there is for the audience to recognise a channel that they like ore dislike.
In addition, colour is used a lot in idents and there are specific colours for a particular channel.
Also vibrant colours associated with different channels, for example BBC One's accent colour is red, E4 as purple and BBC sport are yellow. The limitation of colour is almost the same as typography, however the reason as to why the colour is not changed for the idents is due to the fact that there would be consistency and it allows the audience to make an acknowledgement of the channel easily. Another point is that the channels can be more original through the idents imagery, making them different from other channels as there will be all sorts of individuals who will be attracted to a certain channel for a certain purpose behind it all.
Furthermore, aspect-ratio is the dimensions required to fit the screen. Thus their are guidelines to follow one of the most important being that the ident has to be of high definition which can be delivered in 16.9 widescreen. It means that the active image must fill a 16.9 screens vertically also horizontally without geometric distortion. Plus the positive limitation of an aspect ratio is that most of the population have a TV wide enough for the whole ident. Yet this is also a negative limitation as some people will not have a perfect sized TV, hence the picture will always be distort and jarring.
Adhering to a desired tone
As said in the title this is making sure the ident as well as the tone for the channel is appropriate for the viewer. Therefore, the positive limitation is that a channel such as BBC Four will be created for a mature audience. Yet if a child was to see an ident which is made for elder people rather than children their age then they will find it dull. A further point is that if the tone is not right then it will be a surprise, and becomes a turn off for the audience. For example the image down below for CBeebies would be appropriate for the audience which are children because it is simple and includes a lot of vibrant colours, along with the tone being exciting as it has a memorable jingle. Also the yellow blobs intend that the channel is not too serious. Whereas the BBC Four ident with the books implies that the channel is for intellectual people as it will be more informative than entertainment led.
Duration
Lastly, duration is how long an ident can be shown for in between programmes to keep the schedule on the right track. When idents have a duration they could be either longer or shorter, and the limitation of shorter idents is that they will possibly not provide enough information for the audience to know what could be shown on the channel. But the positive of a short ident is that the viewer will not have to wait so long to watch a programme if they have acknowledged everything that might be shown on the channel. However, longer idents are likely to have the same problem as a shorter ident, because it will just get very repetitive after it has been viewed once. On the other hand, it allows people to have a bit of time to get themselves ready for the programme. Plus if there is any problems with the scheduling then a longer ident can be used as an emergency. Thus the longer ident down below shows that dogs have done much more and towards they end there is a loop of the dogs going round in circles, so that is the difference between both a short and long ident.
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