Image Util

Tizen offers the following image processing features:

Conversion

You can change the colorspace format. The following tables define the supported formats.

Table: RGB pixel formats
Label	FOURCC in hex	Bits per pixel	Description
RGB	0x32424752	1, 4, 8, 16, 24, 32	Alias for BI_RGB
RGBA	0x41424752	16, 32	Raw RGB with alpha. Sample precision and packing is arbitrary and determined using bit masks for each component, as for BI_BITFIELDS.

Table: Packed YUV formats
Label	FOURCC in hex	Bits per pixel	Description
UYVY	0x59565955	16	YUV 4:2:2 (Y sample at every pixel, U and V sampled at every second pixel horizontally on each line). A macropixel contains 2 pixels in 1 u_int32.
YUYV	0x56595559	16	Duplicate of YUY2.

Table: Planar YUV formats
Label	FOURCC in hex	Bits per pixel	Description
YV16	0x36315659	16	8-bit Y plane followed by 8-bit 2x1 subsampled V and U planes.
YV12	0x32315659	12	8-bit Y plane followed by 8-bit 2x2 subsampled V and U planes.
I420	0x30323449	12	8-bit Y plane followed by 8-bit 2x2 subsampled U and V planes.
NV12	0x3231564E	12	8-bit Y plane followed by an interleaved U/V plane with 2x2 subsampling.
NV21	0x3132564E	12	As NV12 with U and V reversed in the interleaved plane.

You can decode and encode images with the following formats:

Bitmap formats:
- YUV420, YUV422, RGB888, RGBA8888, BGRA8888, ARGB8888
Input image formats for decoding:
- Only JPEG is supported when using image util

Output image formats for encoding:

Quality vs. size

Table: Quality and size comparison
Quality	Size (bytes)	Compression ratio	Description
Highest quality (Q = 100)	83,261	2.6:1	Extremely minor artifacts
High quality (Q = 50)	15,138	15:1	Initial signs of subimage artifacts
Medium quality (Q = 25)	9,553	23:1	Stronger artifacts; loss of high-frequency information
Low quality (Q = 10)	4,787	46:1	Severe high frequency loss; artifacts on subimage boundaries ("macroblocking") are obvious
Lowest quality