Image Thumbnail

Last Updated：2020-09-29

Overview

This article describes how to thumbnail the image.

Image Thumbnail Parameters

Command parameter

Parameter name	Resizing command	Type	Value range	Request description	Default value	Is it required
scale	s	unsigned int	0,1,2	Designate the resize method. s 0 means no cutting, equal scaling; s 1 means stretch scaling; s_ 2 means center cutting and scaling in equal proportions.	0	No
width	w	unsigned int	1~4096	Specify the maximum width of the target thumbnail The unit will be px.	-	If s_1, s_2 is selected, must be chosen
height	h	unsigned int	1~4096	Designate the maximum height of targeted thumbnail which is in px.	-	If s_1, s_2 is selected, must be chosen
limit	l	unsigned int	0,1	Specify whether to limit the size of the photo scaling: l_0 means that the size of the photo scaling is not limited; l_1 indicates that the scaling size (length and width) of the photo cannot exceed the size of the original image.	0	No

Caution

If under the situation of s_0, that is, no clipping with uniform scale:

Either w or h can be selected, and the photo should be scaled according to the specified parameter scale. For example, if the size of the original drawing is 100 × 200 and the specified parameter is w_50, the size of the photo processing should be 50 × 100; and if the specified parameter is h_50, the size of the photo processing should be 25 × 50.

If w and h are specified at the same time, the system will take the parameter with the smaller value of “target width/original width” and “target height/original height” as the standard for equal scale. E.g.: If the size of the original drawing is 400 × 500 , and the specified parameter is w_100, h_200, the system will be scaled according to the scale of w_100, and the target size will be 100 × 125 due to “100/400”< “200/500”. ;

When s_1, the values of w and h must be specified at the same time;

When s_2, the values of w and h must be specified at the same time. When w and h are specified, the photo will be scaled equally according to the parameter with the smaller value of “target width/original width” and “target height/original height”, and the other side with the larger value will be cropped in the middle. E.g.: If the size of the original drawing is 500 × 1000 , and the specified parameter is s_2, w_250, h_600, the system will be scaled according to the targeted width of 250, and the height will be cropped to 500 in the middle.