Cs50 under standing technology
exam 3
-1How are MIDI files different from MP3 files for the same song?
Answer : MP3 is a type of audio file, (in a lossy compression format): MP3 is a
(compressed) digital a recording of sound.
MIDI files do not contain an audio file, they do not contain a recording of sound.
MIDI files are the computer equivalent of sheet music: they contain the instructions on how to play
the tune, a tune which could be played by a wide range of (computer generated) instruments.
2 - What is a keyframe?
Answer :
Keyframes are the important frames which contain
information of a start/end point of an action
3 - When might you want to use a GIF instead of a JPEG?
Answer : When the file is a group of
consecutive images that is a short animation
video, then the GIF must be used because the
jpeg is an extension for images only
, 4- When might you want to use a JPEG instead of a GIF?
Answer :. JPEGs are often used with photographs and images with high resolution and
color quality because JPEG supports 16 million colors.
But GIF supports only 256 colors.
5- Let's assume that these images are the same resolution -- 300 pixels by 200
pixels, and both are static (non-video/non-looping) GIFs. Nevertheless, it turns out
that the German GIF is smaller (i.e., fewer bytes) than the French GIF. Hypothesize
why that might be.
- Be sure to re-read this stipulation carefully. When you download these images, you
may find that the German GIF is bigger, for example (there are different GIF-
encoding techniques which can cause this). Nevertheless, we are stipulating that
they are both 300x200, and that the German one is smaller, and that should be your
assumption in your answer.
Answer : Both the flags contain three kinds
of colors each, so that might not be the
reason for the difference in their sizes.
However, the German flag has the colors
arranged in a horizontal manner, unlike the
French flag, which means that if it is
exam 3
-1How are MIDI files different from MP3 files for the same song?
Answer : MP3 is a type of audio file, (in a lossy compression format): MP3 is a
(compressed) digital a recording of sound.
MIDI files do not contain an audio file, they do not contain a recording of sound.
MIDI files are the computer equivalent of sheet music: they contain the instructions on how to play
the tune, a tune which could be played by a wide range of (computer generated) instruments.
2 - What is a keyframe?
Answer :
Keyframes are the important frames which contain
information of a start/end point of an action
3 - When might you want to use a GIF instead of a JPEG?
Answer : When the file is a group of
consecutive images that is a short animation
video, then the GIF must be used because the
jpeg is an extension for images only
, 4- When might you want to use a JPEG instead of a GIF?
Answer :. JPEGs are often used with photographs and images with high resolution and
color quality because JPEG supports 16 million colors.
But GIF supports only 256 colors.
5- Let's assume that these images are the same resolution -- 300 pixels by 200
pixels, and both are static (non-video/non-looping) GIFs. Nevertheless, it turns out
that the German GIF is smaller (i.e., fewer bytes) than the French GIF. Hypothesize
why that might be.
- Be sure to re-read this stipulation carefully. When you download these images, you
may find that the German GIF is bigger, for example (there are different GIF-
encoding techniques which can cause this). Nevertheless, we are stipulating that
they are both 300x200, and that the German one is smaller, and that should be your
assumption in your answer.
Answer : Both the flags contain three kinds
of colors each, so that might not be the
reason for the difference in their sizes.
However, the German flag has the colors
arranged in a horizontal manner, unlike the
French flag, which means that if it is
