1、设定数码相机的参数
数码相机在其设置菜单中,一般都提供多种设定参数,其中包括图像分辨率、聚焦方式、光圈、快门等。对于数码相机来说,最主要、最常用的是图像分辨率的设置。由于数码相机有多种参数设置,因此,每次拍摄之前,必须检查相机的设置菜单,以确认分辨率、快门等参数是否设置正确。否则,拍出的照片可能达不到预期效果。
注:设置数码相机的分辨率,应尽量使用最高分辨率这一档。
2、尽量使被拍对象主体充满取景框
使用数码相机时,为取得更好的效果,应尽量选择最高分辨率,并使被拍对象主体充满取景框。
如果只是拍摄一个单独的对象,例如一个手术部位,一个标本,这时应将被拍对象主体充满取景框,至于照片的构图,可以不作重点考虑。
3、正确运用光照度和闪光灯
由于数码相机是由内置图像传感器(CCD芯片)拾取图像的,因此,只有在合适的光照条件下才能拍出好的照片。
在拍照之前,应尽可能创造出好的光照条件。常规的胶卷虽然也受光照度影响,但是曝光稍不足的底片,可在后期制作中校正,其色调和色彩质量则较少依赖光照强度。由于CCD芯片的特点,数码相机是完全依赖光照条件的。如果光照太强,数码相机拍出的照片会受到难以消除的带状干扰。另一方面,由于CCD芯片有一定的感光阀值(敏感度),如果光线太暗,达不到数码相机要求的最低光照度,拍出的照片效果极差。即使光照度满足数码相机的最低要求,但也会严重地影响数码照片的清晰度。
大部分数码相机都设内置闪光灯,一般有四档:闪光、不闪光、防红眼闪光和自动闪光。自动闪光这一档是由相机对被拍对象光照度的检测,决定是否需要用闪光来补充光线。闪光灯不像其它光源那么容易控制,闪光灯射出的光线容易被周围附近的物体反射回来,在照片上形成不均匀的光斑。
4、色温的调节
都知道彩色胶卷有日光型和灯光型之分,目的是为了适用于不同光源的光照环境,日光色温是5400K,灯光色温是3200K。
数码相机用CCD芯片作为传感器,没有光源类型之分,为了适应不同的光源环境,采用白平衡调节方法校正照片的色温。数码相机的白平衡调节分为手动和自动两种模式,手动调节具有更多的灵活性,能创造出意想不到的艺术效果,令数码照片的白平衡更加精确,但手动调节比较难掌握。自动调节可以保证拍摄的效果不会偏差很大,但难以创造出特别的艺术效果或精确的白平衡。光源的色温对数码照片的影响很大,用数码相机拍摄时,必须针对不同的摄影环境调节好白平衡。
1, the parameter of set number camera
Digital camera is in its setting menu, offer a variety of set parameter commonly, include means of picture resolution, focusing, aperture, shutter to wait among them. To digital camera, the the mainest, most commonly used is the setting of picture resolution. Because digital camera has a variety of parameter settings, accordingly, before filming every time, must check the setting menu of camera, whether to install in order to affirm the parameter such as resolution, shutter correct. Otherwise, the picture that takes is likely short of expects the result.
Note: Install the resolution of digital camera, should use highest resolution as far as possible this first gear.
2, make main body of the object that be patted fills frame of find a view as far as possible
When use number camera, it is the effect with be obtained better, answer to choose highest resolution as far as possible, make main body of the object that be patted fills frame of find a view.
If just film a sole boy or girl friend, for example an operation place, a specimen, answer to fill main body of the object that be patted frame of find a view at this moment, as to the composition of a picture of the photograph, need not make key consideration.
3, intensity of illumination of proper use consumed and flashlight
Because digital camera is by inside buy image sensor (CCD chip) of collect image, accordingly, below appropriate illumination condition only ability takes good picture.
Before take a picture, answer to create the illumination condition that has given as far as possible. Although groovy film also suffers illuminance effect, but the negative with a bit insufficient exposure, lieutenant Colonel can be made in later period, its color mediates colour quality depends on illumination intensity lesser. As a result of the characteristic of CCD chip, digital camera depends on illumination condition completely. If illumination is too strong, what the picture that digital camera takes can be eliminated hard is banding interference. On the other hand, because CCD chip has certain sensitive threshold values (susceptibility) , if the light is too dark, camera of short of number wants the lowermost illuminance that beg, the photograph effect extreme difference that takes. Although illuminance satisfies the lowermost requirement of digital camera, but the definition that also can affect digital picture severely.
Major amount camera is set inside buy flashlight, have 4 grade commonly: Not flashy, flashy, prevent red-eyed glitter and automatic glitter. Flash this first gear is automatically be opposite by camera of illuminance of the object that be patted detect, whether does the decision need to complement with glitter the light. Illuminant of flashlight unlike other is controlled so easily, the beam that flashlight shoots is light by all round the object around is reflexed come back, inhomogenous facula is formed on the photograph.
4, colour temperature adjustment
Know chromatic film has sunlight model with lamplight model cent, the purpose is to apply to the illumination environment of different illuminant, solar and colour temperature it is 5400K, lamplight is colour temperature it is 3200K.
Digital camera serves as sensor with CCD chip, do not have the cent of illuminant type, to get used to different illuminant environment, use method of Bai Pingheng adjustment of corrective photograph colour temperature. The Bai Pingheng of digital camera adjusts cent is moved for the hand and automatic two kinds of mode, the hand is moved adjust have more flexibility, can create the artistic effect that gives expect to be less than, make the Bai Pingheng of digital photograph more accurate, but the hand is moved adjust master harder. Self-adjusting the result that can assure to film won't error is very big, but create a special artistic effect or accurate Bai Pingheng hard. Of illuminant colour temperature very big to the influence of digital photograph, when filming with digital camera, must be aimed at different photography conditioning good Bai Pingheng.