1、PS基础的知识点及原理PHOTOSHOP(ps)基础知识及原理培训目的如今电脑技术飞速发展，Photoshop即将成为PPT、Word、excel之后必备技能之一，为有兴趣的同事提供学习的机会，增强有关Photoshop方面技能，使大家在日后的工作学习中更得心应手地应用相关技能。一、PS的基本知识1、像素：图像是由像素组成，像素就是一个单位矩形的颜色块，是图像的基本单位。每个像素都有不同的颜色值，单位面积内的像素越多，图片越清晰，反之，则越模糊。2、分辨率：分辨率是指单位长度上像素的多少，像素越多，图像越清晰。PS中，普通显示器的分辨率为72像素/英寸大型灯箱图像分辨率为30像素/英寸网页图像
2、的分辨率为72像素/英寸或96像素/英寸报纸图像的分辨率为160像素/英寸普通彩版印刷品为300像素/英寸精美彩版印刷品为350像素/英寸户外墙体广告在30像素/英寸以下3、位图：位图的大小和质量取决图片像素的多少，单位面积内像素越多则越清晰，当位图放大的一定限度时，会发现是由很多的小方格组成，上图所示4、矢量图矢量图也称为向量图，它由点线面等元素组成，记录的为形状，线条粗细，以及色彩等，简单的说也就是在任何分辨率里面，对矢量图进行任意的缩放，不会影响他的光滑度和清晰度。矢量图主要适应于：文字设计、图案设计、版式设计、标志标识设计、工艺美术设计以及计算机辅助设计（CAD工业制图）。矢量软件：A
3、utoCAD（CAD）、Coreldraw（CDR）、Illustrator（AI）、Freehand（不会，没用过）5、常用的图片存储格式PSD：是ps专用的位图格式，可以保存图层，通道，路径等信息BMP：全程Bitmap，是windows操作系统中的标准图片格式，因不采用任何的压缩方式，故文件所占空间比较大，平常用的比较少。JPEG(JPG/JPE)：JPEG图像压缩算法能够在提供良好的压缩性能的同时，具有比较好的重建质量，被广泛应用于图像、视频处理领域。Jpg格式压缩有损耗，压缩比能达到100:1，由于所占空间小，常在万维网中被用来储存和传输照片的格式。适用于对文件信息及色彩要求不高的情
4、况。PNG：采用无损压缩，支持透明效果。一般常用于java程序，网页等，原因是压缩比高，生成文件所占空间小。PDF：电子印刷品文件格式，优点在于能跨平台保留文件原有格式。TIFF：tiff是一种比较灵活的图像格式，因为tiff文件可以是不压缩，所以文件比较大，也可以是压缩的，采用无损压缩方案储存。户外广告喷绘、写真及印刷 常用TIFF格式保存，且是CMYK模式。GIF：GIF格式可以存多幅彩色图像，如果把存于一个文件中的多幅图像数据逐幅读出并显示到屏幕上，就可构成一种最简单的动画。GIF分为静态GIF和动画GIF两种，扩展名为.gif，是一种压缩位图格式，支持透明背景图像，适用于多种操作系统，
5、“体型”很小，网上很多小动画都是GIF格式。其实GIF是将多幅图像保存为一个图像文件，从而形成动画，最常见的就是通过一帧帧的动画串联起来的搞笑gif图，所以归根到底GIF仍然是图片文件格式。常见的为QQ动态表情。PS是photoshop的简称。主要功能就是P图，改图，作图等；既然聊到PS，首先我们要了解色彩。色彩三属性：色相（H），饱和度（S），亮度（B）。PS的操作无论怎么搞都离不开改这3个属性。色光的三原色：R（红色），G（绿色），B（蓝色），级别分为0-255，一共256个级别。RGB为0时是黑色，为255时是白色，数值相同时是灰色。这就是常说的黑白灰。印刷三原色：C（青色），M（洋红）
6、，Y（黄色），K（黑色油墨，主要是为了使黑色更纯更深）6、色彩模式：HSB模式：色相（H），饱和度（S），亮度（B）。色相就是红与绿的区别，亮度就是一个5瓦和一个100瓦的灯泡的区别，饱和度就是一滴墨水和一瓶墨水倒进盆子里面的区别。或者说是吃一个馒头和吃5个馒头给你的感觉。RGB模式：应用广泛，主要是用于计算机显示器，电脑，幻灯片等非印刷材料使用。Lab模式：CMYK模式：打印色，减色，印刷使用。灰度模式：只有单纯的黑白灰，素描就是灰度模式的图像。二、PS的工作原理：简单的说就是各种图层的叠加，图层就是各式各样的纸，有实色的有透明的，这些纸上面画上你所需的元素（文本、图像、背景、内容等）。然后
7、各个纸张叠加，形成一本书。而这本书就是你设计出来的图片。最底下有一张有色的纸，然后上面用一张张透明的纸叠加起来的一个效果，这就是图层。例如：+结果：操作步骤：图层1位背景图，图层2位元素图，用矢量蒙版，图层3为文字图层，最后叠加图得道最终效果图 知识赠送以下资料英语万能作文(模板型）Along with the advance of the society more and more problems are brought to our attention, one of which is that.随着社会的不断发展，出现了越来越多的问题，其中之一便是_。As to whether it
8、is a blessing or a curse, however, people take different attitudes.然而，对于此类问题，人们持不同的看法。(Hold different attitudes 持不同的看;Come up with different attitudes 有不同的看法)As society develops, people are attaching much importance to.随着社会的发展，人们开始关注.People are attaching more and more importance to the interview dur
9、ing job hunting求职的过程中，人们慢慢意识到面试的重要性。As to whether it is worthwhile ., there is a long-running controversial debate. It is quite natural that people from different backgrounds may have divergent attitudes towards it.关于是否值得_的问题，一直以来争论不休。当然，不同的人对此可能持不同的观点。In the process of modern urban development, we
10、often find ourselves in a dilemma.在都市的发展中，我们往往会陷入困境。Recently the phenomenon has aroused wide concern, some people are in alarm that.最近，这种现象引起了人们的广泛关注，有人开始担心_。The human race has entered a completely new stage in its history, with the increasingly rapid economic globalization and urbanization, more pr
11、oblems are brought to our attention.人类进入了一个历史的崭新的阶段，经济全球化、都市化的速度不断加快，随之给我们带来了很多问题。. plays such an important role that it undeniably becomes the biggest concern of the present world, there comes a question, is it a blessing or a curse?_显得非常重要而成为当今世界所关注的最大的问题，这是无可厚非的。不过，问题是：我们该如何抉择?Now we are entering
12、 a new era, full of opportunities and challenges,现在我们正在进入一个充满机会和挑战的新时代。People from different backgrounds would put different interpretations on the same case.不同行业的人对同一种问题的解释不尽相同。The controversial issue is often brought into public focus. People from different backgrounds hold different attitudes tow
13、ards the issue.这中极具争议性的话题往往很受社会的关注。不同的人对此问题的看法也不尽相同。When asked ., some people think. while some prefer.说到_，有人认为_，而另一些人则认为_。Just as the saying goes: so many people, so many minds. It is quite understandable that views on this issue vary from person to person.俗话说，。不同的人对此有不同的看法是可以理解的。To this issue, dif
14、ferent people come up with various attitudes.对于这个问题，不同的人持不同的观点。There is a good side and a bad side to everything, it goes without saying that.万事万物都有其两面性，所以，勿庸置疑，_。When it comes to ., most people believe that ., but other people regard .as .提到_问题，很多人认为_，不过，一些人则认为_是_.When faced with., quite a few peop
15、le claim that ., but other people think as.提到_问题，仅少数人认为_，但另一些人则认为_。There is a public controversy nowadays over the issue of . There who criticize .argue that ., they believe that .,but people who favor ., on the other hand, argue that.目前，_问题争议较大。批判_的人认为_，他们认为_，不过，另一方面，赞同_的人则认为_。Some people are of th
16、e opinion that. 有些人认为_。Many people claim that. 很多人认为_。A majority of 绝大多数A large number of 很多人Some people contend that . has proved to bring many advantages (disadvantages)有些人认为_有很多有利之处(不利之处)。Those who argue for . say that .economic development of the cities.觉得_的人认为，_ 城市的经济发展。Some people advocate tha
17、t .有些人在坚持认为_。They hold that . 他们认为_。People, who advocate that ., have their sound reasons (grounds)坚持认为_的人也有其说法(依据)。Those who have already benefited from practicing it sing high praise of it. 那些从中受益的人对此大家褒奖。Those who strongly approve of . have cogent reasons for it.强烈认同_的人有很多原因。Many people would cla
18、im that. 有人会认为_。People who support . give some or all of the following reasons.那些支持_观点的人列出了如下原因：_。But others hold the view that .但是，另外一些人则认为_。观点的用词：Attitude, opinion, 与其搭配的动词以及词组：Take, have, come up with，set forth, put forward等。But on the other hand, there are also quite a few people who strongly ad
19、vocate that.,.不过，另一方面，也有少部分人坚持认为_。But people who are ., on the other hand , maintain that.不过，另一方面，_的人认为_。However, there are a large number of people who hold a different view concerning this case.然而，很多人对此有不同的看法。问题用词：Issue, phenomenon，后接介词, on, over等。However, some others argue that. 然而，另一些人则认为_。Howev
20、er, there are also some others who contend that.然而，也有人认为_。But other people set forth completely totally different argument concerning this case.不过，对于此，另一些人则持完全不同的观点。Some people examine this issue from another angle.有的人用另一角度来看这一问题。On the other hand, there are also many opponents who strongly .另一方面，也有
21、很多反对的人，他们认为_。According to my personality and fondness, I would prefer . rather than.根据我的个性以及兴趣，我选择_而不会选择_。Personally, I side with the latter (former) opinion.就我个人而言，我支持后者(前者)_。Personally, I am in favor of the former point of view.就我个人而言，我较同意前一种看法。To my point of view 我认为To my mind, the advantages far
22、 overweigh the drawbacks(disadvantages, shortcomings)我认为，优点胜过缺点。For my part, I stand on side of the latter opinion that.就我而言，我较赞同后一种观点_。As far as I am concerned, I am inclined to be on the side of the latter view.在我看来，我较同意后一种观点。After a thorough consideration, for my part, I am in favor of the latter
23、 view that. 经过深思熟虑，我较支持后一种看法，亦即_。If asked to make a decision, I would prefer.如果真的需要作出选择，我宁愿_。展现问题篇问题的常用词：question, problem, issueRecently, the issue of . has been brought into public focus.近来，_的问题引起了社会的广泛关注。Now we are entering a brand new era full of opportunities and innovations, and great changes
24、have taken place in peoples attitude towards some traditional practice.现在我们进入了一个充满机遇和创新的崭新时代，很多人对某些传统的看法也发生了很大改变。Recently the issue of whether or not . has been in the limelight and has aroused wide concern in the public.近来，是否_的问题已经非常明确而且引起了社会的广泛关注。The issue whether it is good or not to . has arouse
25、d a heated discussion all over the country._的利与弊已在全国范围内引起热烈的讨论。At present, some people think .while others claim .Both sides have their merits.目前，一些人认为_而另一些人则认为_。其实，两种观点都其可取之处。People rarely reach an absolute consensus on such a controversial issue.对于这种极具争议的话题，我们很难作出绝对的回答。People from different backgr
26、ounds would put different interpretations on the same case.不同行业的人对同一种问题的解释不尽相同。The controversial issue is often brought into public focus. People from different backgrounds hold different attitudes towards the issue.这中极具争议性的话题往往很受社会的关注。不同的人对此问题的看法也不尽相同。When asked ., some people think. while some pre
27、fer.说到_，有人认为_，而另一些人则认为_。Just as the saying goes: so many people, so many minds. It is quite understandable that views on this issue vary from person to person.俗话说，。不同的人对此有不同的看法是可以理解的。To this issue, different people come up with various attitudes.对于这个问题，不同的人持不同的观点。There is a good side and a bad side to everything, it goes without saying that.万事万物都有其两面性，所以，勿庸置疑，_。When it comes to ., most people believe that ., but other people regard .as .提到_问题，很多人认为_，不过，一些人则认为_是_.When faced with., quite a few people claim that ., but other people think as.提到_问题，仅少数人认为_，但另一些人则认为_.
