在我们学习今天的知识前，回顾下上期所学的知识点：画布大小及裁剪知识。所谓画布大小，即为可被我们操作的区域大小为多少，摁ctrl+alt+c，可以打开画布属性的面板，可以看见整个画布的大小，可以进行单位的转换，如厘米，英寸，毫米等，可以调整画布的大小，注意调小时，图层里图片的位置是不会改变的。
裁剪工具：快捷键：C
当选择裁剪工具时，画布周围出现了可以调节的白点，可以调节画布的大小，也可以按alt键，以中心点进行调整，shift键进行等比例调整。裁剪工具也可以和选框工具一起使用，可以先使用选框工具精准框选选区，再使用裁剪工具进行裁剪。
1、 Review
Before we learn today's knowledge, review the knowledge points learned in the previous period: canvas size and cutting knowledge. The so-called canvas size refers to the size of the area that can be manipulated by us. By pressing ctrl+alt+c, you can open the canvas properties panel and see the entire canvas size. You can convert units, such as centimeters, inches, millimeters, and so on. You can adjust the size of the canvas. Note that when adjusted, the position of the image in the layer will not change.
Crop Tool: Shortcut: C
When selecting the cropping tool, there are adjustable white dots around the canvas. You can adjust the size of the canvas, or press the alt key to adjust to the center point, and the shift key to adjust proportionally. The crop tool can also be used with the frame selection tool. You can use the frame selection tool to accurately frame the selected area before using the crop tool to crop.
PART2、图像大小知识讲解
上次我们讲解了画布大小的相关知识，这次我们来讲解图像大小的相关知识。
画布属性栏快捷键：ctrl+alt+c；
如何打开图像属性框快捷键：CTRL+alt+I；
画布大小和图像大小的区别：
图像大小是图像自身的属性，包括像素、尺寸、分辨率等参数，改变图像大小就是通过改变这些参数实现的。画布是整个文档的工作区域，即图像的显示区域。画布可以根据需要来增加、减少或者旋转，增加画布大小可在图像周围添加空白区域，减少画布大小会裁剪图片。
PART2. Explanation of image size knowledge
Last time we talked about canvas size, this time we'll talk about image size.
Canvas property bar shortcut key: ctrl+alt+c;
How to open the image property box shortcut key: CTRL+alt+I;
The difference between canvas size and image size:
Image size is an attribute of an image itself, including parameters such as pixels, size, and resolution. Changing image size is achieved by changing these parameters. The canvas is the working area of the entire document, that is, the display area of the image. The canvas can be increased, decreased, or rotated as needed. Increasing the canvas size can add blank areas around the image, while reducing the canvas size can crop the image.
PART3、实例演示
为了能够更好的理解二者区别，我们下面看一个实例。
1、首先，创建多个图层，创建一个矩形和椭圆，标注图像大小和画布大小，字体大小，为后续的改变做好参考。建立一个200*100的矩形，一个100*100的圆形，字体设置为仿宋60像素，画布大小设置为2000*1600；
PART 3. Example demonstration
To better understand the differences between the two, let's take a look at an example.
1. First, create multiple layers, create a rectangle and ellipse, and label the image size, canvas size, and font size for future changes. Create a 200 * 100 rectangle and a 100 * 100 circle, set the font to 60 pixels in imitation Song, and set the canvas size to 2000 * 1600;
2、接下来把图像大小调整到1000*800，检查各个数值的变化，首先发现字体变为30像素；画布尺寸变成1000*800，矩形需要用到路径选择工具或者直接选择工具选中看见直接尺寸，变为100*50，圆形变为50*50，说明调整图像大小时会等比例影响图层的大小，会按照一定的比例改变。画布的大小是改变画板的大小，不改变图层的大小；图像的改变会改变整个画板的大小同时调整图像的比例。
2. Next, adjust the image size to 1000 * 800, and check the changes in various values. First, it is found that the font has changed to 30 pixels; The canvas size becomes 1000 * 800, and a rectangle needs to be selected using the path selection tool or the direct selection tool. When the direct size is selected, it becomes 100 * 50, and the circle becomes 50 * 50. This indicates that adjusting the image size will affect the size of the layer in an equal proportion, and will change in a certain proportion. The size of the canvas changes the size of the canvas without changing the size of the layer; Changing the image will change the size of the entire drawing board while adjusting the image scale.
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