Colors in a specific region in an image

hi all;
i have an image and a list of 4 RGB colors.
i need to check a specific region of the image (a small sub-image) to see if it contains any of the 4 colors i have.
what my best option here?
any help would be great.
thanks in advance.

This can be easily done with a StringBuffer:StringBuffer sb = new StringBuffer("leone24");
sb.replace(5,7,"31");
String newString = sb.toString();

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Hi Experts,
Am looking to assign a color for a (specific)row in ALV report.......so, pls. let me know How to get it done?
thanq

TABLES:LFA1.
SELECT-OPTIONS:LIFNR FOR LFA1-LIFNR.
DATA:BEGIN OF ITAB OCCURS 0,
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NAME1 LIKE LFA1-NAME1,
LAND1 LIKE LFA1-LAND1,
ORT01 LIKE LFA1-ORT01,
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CFIELD(4) TYPE C,
END OF ITAB.
data:col(4).
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IN LIFNR.
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DATA:LAYOUT TYPE SLIS_LAYOUT_ALV.
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EXPORTING
I_PROGRAM_NAME = SY-REPID
I_INTERNAL_TABNAME = 'ITAB'
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CHANGING
CT_FIELDCAT = FCAT.
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EXPORTING
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IT_FIELDCAT = FCAT
TABLES
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this is for coloring cols
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PARAMETERS:LIST RADIOBUTTON GROUP ALV DEFAULT 'X',
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National Instruments
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