ASPECT RATIO
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Transcript of ASPECT RATIO
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ASPECT RATIO
PAŠIĆ ANELA
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Aspect Ratio• Aspect Ratio-odnos između širine i visine slike.• Predstavlja se kao : x:y• X-širina slike,y-visina slike• DAR- Display Aspect Ratio• PAR- Pixel Aspect Ratio• SAR- Storage Aspect Ratio
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Formule za računanje SAR,PAR I DAR
• SAR se računa po formuli : • SAR=W/H, W-visina slike, H-širina slike• PAR=DAR/SAR • DAR računamo po • DAR=SARxPAR
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Tabela sa standardnim PAR,DAR I SAR parametrima
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PRIKAZ VIDEA SA ISPRAVNIM ASPECT RATIOM KOJI NEMA ODGOVARAJUĆI ASPECT RATIOM
• Ako se desi da se aspect ratio ne podudara sa aspect ratiom ekrana,rješavamo pomoću dvije metode:
• Letterbox• Pan&Scan
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STANDARDNI I NAJČEŠĆE KORIŠTENI ASPECT RATIO
• Računarski prikaz• 4:3 standard• 16:10 standard
STANDARDNI I NAJČEŠĆE KORIŠTENI ASPECT RATIO
Tv sa 4:3 standardom
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• 16: 9 STANDARD• 1.85:1 i 2.35:1
Tv sa 16:9 Standardom
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CROPPING I ASPECT RATIO
• Cropping-metoda smanjivanja rezolucije kod videa
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Zadaci :
• Primjer 1:• Ako uzmemo za primjer neki video rezolucije
500x300 onda kada upotrijebimo formulu za SAR dobijemo :
• SAR=W/H=500/300 tj.• 5:3
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Primjer za PAR
• Primjer 2 : • Ako je PAR 15:14 to znači da je širina pixela za
jednu četrnaestinu veća od visine pixela. • Ako je PAR 12:11 to znači da je širina pixela za
jednu jedanaestinu veća od visine pixela.
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Primjer za cropping
• Ako na videu rezolucije 640x480 obavimo cropping po 80 pixela od visine slike ( po 40 sa gornje i 40 sa donje strane:
• Top:40px• Bottom:40px• Left : 0px• Right: 0px• Dobit ćemo video rezolucije 640x480.
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KRAJ