In order to help candidates sort out the knowledge points, the Chinese teacher specially prepared multimedia exercises for the information technology teacher recruitment examination for everyone. I hope candidates can break through the key points and difficulties through the following exercises.
1. In the image processing software, when viewing an image using the color scale dialog box, if the color scale distribution shown in the figure below appears, it means the image ().
A. the tone is gloomy. B. Overexposure during shooting
C. Too high color saturation D. Too low color saturation
1. Answer A. Meaning of color histogram: The histogram graphically represents the number of pixels at each brightness level of the image and shows the distribution of pixels in the image. The histogram shows the details in shadows (displayed in the left part of the histogram), midtones (displayed in the middle part) and highlights (displayed in the right part). There are many pixels on the left side of the picture, indicating that the shadow of this picture is dark. Color saturation indicates the brightness of image color, and the relationship between color scale and color saturation is not linear, so it can't be judged from the picture.
2. An instance made with Flash software has the following property panels, and the following statement about this instance is true ().
A. the type is "graphics" B. the name is "exchange ..."
C the width is 120, the height is 240 D, and the color Alpha value is 70%.
2. Answer D. Analysis of Chinese public lecturers: From the above picture, we can know that the type is a movie clip; The name is "component 1", the width is 120 and the height is 70, so options A, B and C are excluded.
3. When editing an image in Photoshop, fill the selected area with the specified color. The tool to be used is ().
3. answer D. analysis of Chinese public lecturer: this question examines the proficiency of candidates in Flash software. Option A is a lasso tool to complete the selection of graphics; Option b is a clipping tool, which completes the clipping of graphics; The c option is a zoom tool used to zoom in and out of the graph. The d option is a paint bucket tool, which can fill images.
4.GoldWave software processes dual-channel audio named oldsound.wav If the sound of the right channel is deleted, it will be saved with the file name newsound.wav according to the original sampling frequency, quantization bit number and channel number. Compared with oldsound.wav, the storage capacity of newsound.wav is about ().
A. unchanged B. reduced by half
C. one third. A quarter.
4. Answer B. Analysis of the Chinese lecturer: This question examines the candidates' calculation of the size of the audio file. Storage capacity (bytes) = (sampling frequency× sampling accuracy× number of channels) /8× time, the number of channels is reduced by half, and other things remain unchanged, so the file size is also reduced by half.
5. Multimedia information must be collected and encoded before it can be stored, processed and transmitted by computer. When using a computer to collect sound through a microphone, the three parameters involved are ().
① Sampling frequency ② Sound size and amplitude ③ Channel number ④ Quantization number.
A.①②③ B.①②④ C.①③④ D.②③④
5. Answer C. Analysis by Chinese lecturer: Multimedia sound collection uses three parameters to represent sound, namely: sampling number, sampling frequency and channel number.