Thread: image processing

hey to invert an image, do i have to invert red, green and blue parts of it? or can i just says 255 - image_data for example?

well in my assignment there is some mention about separating it into red green and blue

Code:

red is (image_data[row][column]>>16)&0xff)
blue is ((image_data[row][column]>>8)&0xff)
green is ((image_data[row][column])&0xff)

so would i then take it i have to invert each of those, ie say

Code:

red = (image_data[row][column]>>16)&0xff)

so 255 - red? or wat

thanks

so 255 - red? or wat

Yes. And then you have to shift the red element back to its position in the integer. along with the other colour elements.

would u mind explaing how that is done?

thats what i dont know

well i got this function:
// This routine will set the image pixel data from the supplied matrix
// from top left to bottom right. You must ensure that enough space is
// available.
void ep100_lib_set_data(int data[EP100_LIB_MAX_X][EP100_LIB_MAX_Y])

but not sure after i have inverted the three colors how it applies?

Hey my thread got hijacked

Hmm taurus seems to get more help than me , Where Im stuck is interpreting in pseudocode how I would use memmove() to scroll an image . I see no other way than using simple english description on what would happen . Our lecturer didn't go over any more advanced c functions and how they would be interpreted in pseudocode.

I have this so far

Code:

Algorith Image_Operations;

// The following algorithm shall do a number of operations on the source 
//  image file.

INTEGER data[program_LIB_MAX_X][EP100_LIB_MAX_Y] ;

// This routine will put the image pixel data into the supplied matrix
// from top left to bottom right. You must ensure that enough space is
// available.

PROCEDURE program_lib_get_data(intdata[program_LIB_MAX_X]
[EP100_LIB_MAX_Y]) ;

FUNCTION program_lib_get_data(data); // Get the image data from the user, by calling a function 

PROCEDURE Image_Invert(float data);
Array new[1024][1024]
INTEGER Max_y<--y
INTEGER Max_x<--x
INTEGER Current_y 
INTEGER Current_x
While Current_x < than Max_x;
array[x]<--array[x-255] 
// meant to invert colour , by changing pixel   value 
EndWhile;
While Current_y less than Max_y;
Array[y]<--array[y-255]; 
EndWhile;
new <-- Invert(array x y);

FUNCTION main()
// We must check that image is not bigger than 1024x1024
Output " Please enter size of image { width x height}";

INTEGER X,Y;

Input x,y;

If X>1024 OR Y>1024;

Then Output “ Image too large , try another image “;

It has indentation , but it got lost when I copy / pasted