Y value of the YUV color space.
Syntax
i
Synonyms
i0
i1
Formula
i=(76*r+150*g+29*b)/256 (the output range would be i=[0;254] )
Formula corrected in my patch:
i=(299*r+587*g+114*b)/1000 (the output range would be i=[0;255] )
Original Machine Code (in OPER resource) of Filter Factory 3.0 and 3.0.4 for Photoshop/Win32
| 8B 77 04 | mov esi,[edi+$04] (g) | |
| 8D 34 B6 | lea esi,[esi+esi*4] | |
| 03 F6 | add esi,esi | |
| 8D 34 76 | lea esi,[esi+esi*2] | |
| 8D 34 B6 | lea esi,[esi+esi*4] | |
| 8B 4F 08 | mov ecx,[edi+$08] (b) | |
| 8B D1 | mov edx,ecx | |
| C1 E1 03 | shl ecx,$03 (3) | |
| 2B CA | sub ecx,edx | |
| 8D 0C 8A | lea ecx,[edx+ecx*4] | |
| 03 F1 | add esi,ecx | |
| 8B 07 | mov eax,[edi] (r) | |
| 8B C8 | mov ecx,eax | |
| 8D 04 C0 | lea eax,[eax+eax*8] | |
| 8D 04 41 | lea eax,[ecx+eax*8] | |
| 8D 04 86 | lea eax,[esi+eax*4] | |
| 99 | cdq | |
| 81 E2 FF 00 00 00 | and edx,$000000ff (255) | |
| 03 C2 | add eax,edx | |
| C1 F8 08 | sar eax,$08 (8) | |
| 50 | push eax |