P5
Rollovers
A
rollover is a button that when you hover your mouse over it something, usually
a picture or link that changes in some way. Rollovers are used on websites as a
short cut to the new or exciting information on a webpage. A disadvantage of rollovers is that you need
a newer browser to be able to work them.
An E-card is a digital
version of a greetings card; the receiver can usually access it by a hyperlink
in an email. A disadvantage is that if someone doesn’t have access to the
internet or doesn’t have an email then they won’t be able to receive them. The
disadvantages are that it saves you money as you don’t have to buy them and
they are delivered instantly. The file for
This site offers a range of e-cards for people to personalise, use
background sound and send to people.
E-cards can also take part in viral marketing. This is because if
someone thinks that it’s amusing or good then they can get sent on to friends
and family of the receiver. An email attachment is a file or picture that can
be sent alongside and email, so that the reliever can view what you want sent.
This is how e-cards are sent.
Output Device Issues
For
a mobile, you have to consider that is a smaller screen, so you don’t want
anything too detailed because they won’t be able to see it. Phones also have a
slower processor which means the animation can’t be too complex. The last thing
is that there will be a slower download so the animation file size can’t be too
big.
For
a PC, there tends not to be any restrictions. This is because they have a
larger screen, fast processor and tends to have fibre optics.
For
a big screen, resolution is the only problem. If the animation is made for a PC
then, the animation will have to be scaled to fit the screen, making it
pixelated.
M2:
When you enlarge an image, the resolution decreases. This makes the pixel size increase. This is what makes a picture look fuzzy and pixelated. The same happens when you decrease the image size. The resolution increases and the pixel size decreases.
Frame disposal is the method in which you say whether you
want the image on the previous frame to appear on the current frame. An
advantage of this is that it reduces file size and there will be fewer pixels
in the animation. A disadvantage is that it can affect the quality as it may
delete something that is important the animation.
Auto-Crop is used to ensure that only the part of the
image that is wanted is shown in the image. This means that any unwanted
background that isn't needed is removed. This reduces image size and improves
the quality of the image. It is able to do this as there is less pixels
resulting in a smaller image.
Physical Size of Animated Image
If you are importing an image into your animation then
you have to consider the size to begin with. If you need to increase the size
the images stretches and the pixels become more visible. However if you’re
decreasing the images the image will have a bigger resolution resulting in a
better image quality.
Dithering
There are only 256 colours that you can used when creating
an animation. Dithering is the process in which you combine small dots of colours
such as black or white with another colour in order to create the desired
colour. Dithering increases the file size as you are increasing the amount of
pixels in the animation.
Background Transparency
If the unwanted background if removed by auto-crop then again
there will be less pixels in the image so that means the resolution increases.
Frame Rate:
Reducing frame rate is key for reducing bit rate. The
bit rate will then reduce the file size of the animation.
Resolution:
The bigger the resolution, the fewer pixels which means
that the file size is smaller.
