2006/06/06

Lesson 9

擴散的色彩

色彩的擴散效果與光線特質有很大的關聯。基本上,擴散的色彩色調不足,飽和度也不夠。下雨,有霧或有濃煙的時候,空氣中的微小粒子將光線擴散在大氣中,色彩彼此混合在一起,便會產生色彩飽和度不足的現象。影響色彩的鮮明與擴散有下列幾個原因:

一,物體表面的特性,如一個黯淡而結構粗糙的表面會使光線擴散,減弱色彩的力量。相反的,一個表面光滑會反射光線的物體,則無損物體本身的色彩表現。

二,焦點的設定,在鏡頭焦距外的物體,其色彩逐漸向外擴散並且互相融合。在這裡可以做實驗,以一張被攝主體與背景都清楚的照片,和一張背景模糊的照片,來做比較。


開最大光圈4.5,只有前排的恐龍清楚

Lens: 18-70mm F/3.5-4.5 G
Focal Length: 70mm
Exposure Mode: Aperture Priority
Metering Mode: Multi-Pattern
1/5 sec - F/4.5
Exposure Comp.: +0.7 EV
Sensitivity: ISO 200
Optimize Image: Normal
White Balance: Incandescent
AF Mode: Manual

將光圈縮到18之後,連最後排的恐龍也清楚了

Lens: 18-70mm F/3.5-4.5 G
Focal Length: 70mm
Exposure Mode: Aperture Priority
Metering Mode: Multi-Pattern
3 sec - F/18
Exposure Comp.: +0.7 EV
Sensitivity: ISO 200
Optimize Image: Normal
White Balance: Incandescent
AF Mode: Manual

竹筏和插在上面的旗子,色彩黯淡,透露出即將沒落的訊息

Lens: 18-70mm F/3.5-4.5 G
Focal Length: 18mm
Exposure Mode: Aperture Priority
Metering Mode: Multi-Pattern
1/640 sec - F/4
Exposure Comp.: 0 EV
Sensitivity: ISO 200
Optimize Image: Normal
White Balance: Cloudy
AF Mode: AF-S

以枯木當前景,其灰暗的色彩,道出了世代交替的無奈

Lens: 18-70mm F/3.5-4.5 G
Focal Length: 18mm
Exposure Mode: Aperture Priority
Metering Mode: Multi-Pattern
1/1000 sec - F/8
Exposure Comp.: 0 EV
Sensitivity: ISO 400
Optimize Image: Normal
White Balance: Cloudy
AF Mode: AF-S

除了前面的野花清楚之外,其背景都模糊,色彩明顯的擴散開來

Lens: 70-300mm F/4-5.6 D
Focal Length: 240mm
Exposure Mode: Aperture Priority
Metering Mode: Multi-Pattern
1/640 sec - F/5.6
Exposure Comp.: 0 EV
Sensitivity: ISO 400
Optimize Image: Sharp
White Balance: Shade
AF Mode: Manual

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