raster

简明释义

英[ˈræstə(r)]美[ˈræstər]

n. [电子] 光栅；试映图

英英释义

单词用法

同义词

反义词

例句

1.Combines the color data for the source and destination bitmaps using the specified mask and raster operation.

使用指定的掩码和栅格操作混合源位图和目标位图的颜色数据。

2.Raster image processing system is a vital part of digital printing.

光栅图像处理系统是数字印刷中至关重要的部分。

3.Focus on the principles of raster data storage and applications.

重点讨论存储栅格数据的原理及应用。

4.Several data formats fit the raster model well.

有些数据格式可以很好地适用于栅格模型。

5.It is also very easy to convert from vector to raster formats, but the same ease doesn't hold true vice-versa.

将矢量图转换为光栅图也很简单，可反过来则不行。

6.There are two major choices of data model: raster and vector.

有两种主要的数据模型可选择：栅格和矢量。

7.The library gives programmers a common data model covering all raster data formats and -- through OGR -- vector data formats.

该库为编程人员提供了通用的数据模型，包括所有栅格数据格式和矢量数据格式（通过OGR）。

8.The image was saved in a raster format, which is ideal for photographs.

这张图像以光栅格式保存，适合用于照片。

9.The raster format allows for more detailed color representation in digital art.

在数字艺术中，光栅格式允许更详细的颜色表现。

10.When analyzing satellite imagery, scientists rely on raster data for accurate measurements.

在分析卫星图像时，科学家依赖于光栅数据进行准确测量。

11.In GIS applications, raster data is often used to represent terrain elevation.

在地理信息系统应用中，光栅数据通常用于表示地形高度。

12.You should convert your vector graphics to raster images for web use.

您应该将矢量图形转换为光栅图像以供网页使用。

作文

In the field of computer graphics and digital imaging, the term raster refers to a grid of pixels or dots that compose an image. Each pixel in a raster image represents a specific color and together they form a complete picture. This concept is fundamental in understanding how images are displayed on screens and printed on paper. Unlike vector images, which are defined by mathematical equations and can be scaled infinitely without losing quality, raster images are resolution-dependent. This means that when a raster image is enlarged beyond its original size, it can become pixelated or blurry, resulting in a loss of detail. The creation of raster images typically involves the use of software that allows artists and designers to manipulate individual pixels. Programs like Adobe Photoshop and GIMP are popular tools for editing raster graphics. These applications provide a wide array of features such as layering, blending, and various filters to enhance the visual appeal of the images. The ability to work at the pixel level gives artists precise control over their creations, making raster images ideal for detailed artwork and photographs.One of the most common formats for raster images is JPEG (Joint Photographic Experts Group), which is widely used for photographs due to its efficient compression algorithms. Other popular formats include PNG (Portable Network Graphics), which supports transparency, and GIF (Graphics Interchange Format), known for its animation capabilities. Each format has its own strengths and weaknesses, but they all share the fundamental characteristic of being raster based.In addition to traditional uses in photography and digital art, raster images play a crucial role in various fields such as geographic information systems (GIS) and remote sensing. In GIS, raster data is used to represent spatial information, such as elevation or land cover, allowing researchers and planners to analyze geographical patterns and make informed decisions. Remote sensing technologies, like satellite imagery, also rely on raster data to capture and interpret information about the Earth’s surface.Despite the advantages of raster images, there are challenges associated with their use. One major concern is file size; high-resolution raster images can take up significant storage space, making them less practical for certain applications. Additionally, because raster images lose quality when resized, they are not always suitable for projects that require scalability, such as large banners or billboards. In such cases, vector graphics might be preferred due to their flexibility and scalability.In conclusion, understanding the concept of raster is essential for anyone involved in digital media. Whether you are a photographer, graphic designer, or someone interested in GIS, knowing how raster images work and their limitations can help you make better choices in your projects. As technology continues to evolve, the importance of raster images will likely remain significant, shaping the way we create and consume visual content in the digital age.

在计算机图形学和数字成像领域，术语raster指的是组成图像的像素或点的网格。raster图像中的每个像素代表特定的颜色，所有像素共同形成一幅完整的图像。理解这一概念对于了解图像如何在屏幕上显示和打印至关重要。与通过数学方程定义并且可以无限缩放而不会失去质量的矢量图像不同，raster图像是依赖分辨率的。这意味着当raster图像被放大超过其原始大小时，它可能会变得像素化或模糊，从而导致细节丧失。创建raster图像通常涉及使用软件，使艺术家和设计师能够操纵单个像素。像Adobe Photoshop和GIMP这样的程序是编辑raster图形的流行工具。这些应用程序提供了广泛的功能，如分层、混合和各种滤镜，以增强图像的视觉吸引力。在像素级别工作的能力使得艺术家能够对创作进行精确控制，使得raster图像非常适合详细的艺术作品和照片。raster图像最常见的格式之一是JPEG（联合图像专家组），因其高效的压缩算法而广泛用于照片。其他流行格式包括PNG（可移植网络图形），支持透明度，以及GIF（图形 interchange 格式），以其动画能力而闻名。每种格式都有其自身的优缺点，但它们都具有基于raster的基本特征。除了在摄影和数字艺术中的传统用途外，raster图像在地理信息系统（GIS）和遥感等多个领域也发挥着关键作用。在GIS中，raster数据用于表示空间信息，如海拔或土地覆盖，使研究人员和规划者能够分析地理模式并做出明智的决策。遥感技术，如卫星图像，也依赖于raster数据来捕获和解释关于地球表面的信息。尽管raster图像有许多优点，但其使用也面临挑战。其中一个主要问题是文件大小；高分辨率的raster图像可能占用大量存储空间，使其在某些应用中不太实用。此外，由于raster图像在调整大小时会失去质量，因此它们并不总是适合需要可扩展性的项目，例如大型横幅或广告牌。在这种情况下，由于其灵活性和可扩展性，矢量图形可能更受欢迎。总之，理解raster的概念对任何参与数字媒体的人来说都是至关重要的。无论您是摄影师、图形设计师，还是对GIS感兴趣的人，了解raster图像的工作原理及其局限性都可以帮助您在项目中做出更好的选择。随着技术的不断发展，raster图像的重要性可能仍将显著，塑造我们在数字时代创造和消费视觉内容的方式。