Toshiba e-STUDIO 550, Service Manual

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e-STUDIO550/650/810 IMAGE PROCESSING 7 - 6 JUNE 2002 © TOSHIBA TEC
(2) Image memory editing
This function performs editing such as enlargement/reduction, mirror imaging, etc. using the line memory.
Pixel data for one line in the primary scanning direction are stored in the line memory and the memory
is renewed at each line.
(a) Enlargement/reduction
The enlargment/reduction is accomplished by using the line memory control function in the process
of the image processing operation.
<Example> Enlargement
<Example> Reduction
(b) Mirror imaging
This is accomplished by reading and outputting data from its end.
(3) Edit processing
This function performs trimming, masking and negative/positive reversing.
(a) Trimming
Using rectangular area signals, the image signals inside the rectangular area are left and the
other image signals outside the area are eliminated.
(b) Masking
Using rectangular area signals, the image data inside the rectangular area are erased.
(c) Negative/positive reversing
This function reverses the entire data from negative to positive or vice versa.
1 100%
200%
2 3 4 5 6 7 8 9 10
1 1 2 2 3 3 4 4 5 5
1 100%
50%
2 3 4 5 6 7 8 9 10
1 3 5 7 9
(4) Gamma correction
This function corrects the input/output characteristics of the scanner/printer and adjusts the image
signals so that their input/output characteristics match with the copy mode.
(5) Gradation processing
This function works for genuine reproduction of halftone image such as photographs.
(6) External output system interface
This function controls the output of the output interface between the SLG board and the SYS board
(PWA-F-SYS-340).