Content-type: text/html Man page of mlib_ImageColorHSV2RGB

# mlib_ImageColorHSV2RGB

Section: mediaLib Library Functions (3MLIB)
Updated: 12 Sep 2007

## NAME

mlib_ImageColorHSV2RGB - HSV to RGB color conversion

## SYNOPSIS

```cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_ImageColorHSV2RGB(mlib_image *dst, const mlib_image *src);
```

## DESCRIPTION

The mlib_ImageColorHSV2RGB() function performs a conversion from hue/saturation/value to red/green/blue. The source and destination images must be three-channel images.

It uses the following equations:

```   P = V*(1 - S)
Q = V*(1 - S*fraction(H*6))
T = V*(1 - S*(1 - fraction(H*6)))

R, G, B = V, T, P    if 0   ≤ H < 1/6
R, G, B = Q, V, P    if 1/6 ≤ H < 2/6
R, G, B = P, V, T    if 2/6 ≤ H < 3/6
R, G, B = P, Q, V    if 3/6 ≤ H < 4/6
R, G, B = T, P, V    if 4/6 ≤ H < 5/6
R, G, B = V, P, Q    if 5/6 ≤ H < 1
```

where 0 ≤ H < 1 and 0 ≤ S, V, P, Q, T, R, G, B ≤ 1.

Assuming a pixel in the source image is (h, s, v) and its corresponding pixel in the destination image is (r, g, b), then for MLIB_BYTE images, the following applies:

```   H = h/256
S = s/255
V = v/255
r = R*255
g = G*255
b = B*255
```

for MLIB_SHORT images, the following applies:

```   H = (h + 32768)/65536
S = (s + 32768)/65535
V = (v + 32768)/65535
r = R*65535 - 32768
g = G*65535 - 32768
b = B*65535 - 32768
```

for MLIB_USHORT images, the following applies:

```   H = h/65536
S = s/65535
V = v/65535
r = R*65535
g = G*65535
b = B*65535
```

and for MLIB_INT images, the following applies:

```   H = (h + 2147483648)/4294967296
S = (s + 2147483648)/4294967295
V = (v + 2147483648)/4294967295
r = R*4294967295 - 2147483648
g = G*4294967295 - 2147483648
b = B*4294967295 - 2147483648
```

## PARAMETERS

The function takes the following arguments:

dst

Pointer to destination image.

src

Pointer to source image.

## RETURN VALUES

The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

## ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

 ATTRIBUTE TYPE ATTRIBUTE VALUE Interface Stability Committed MT-Level

mlib_ImageColorHSV2RGB_Fp(3MLIB), mlib_ImageColorRGB2HSV(3MLIB), mlib_ImageColorRGB2HSV_Fp(3MLIB), attributes(5)

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
RETURN VALUES
ATTRIBUTES