I will give you a detailed analysis of the Illustrator software and share with you the tutorial on filling in the color gradient of the image.
Tutorial sharing:
Open the software and create an image (here I will use a rectangular image as an example), as shown in the figure:
On the toolbar, select "rectangle tool" and draw a rectangle on the canvas. (to select the elliptical tool, select "rectangle tool" and press the left mouse button for about two or three seconds:
Select the gradient tool. There are three methods to select the gradient. I marked it in the image, as shown in the figure:
Select the gradient in the toolbar on the far right of AI to call up the gradient tool. The default gradient color is black and white, as shown in the figure:
Next we can adjust the color we want. On the gradient color panel, we can see a gradient slider. We can adjust the slider to change the gradient style, as shown in the figure:
Now let's change the gradient color, click the slider, and then pull the slider. This operation can add a new slider, and then double-click the new slider to bring up the color panel, as shown in the figure:
On the displayed color panel, select the desired color. Then, the selected color will appear on your image, as shown in the figure:
Notes
Note that the default color is black and white gradient.
All right, the above information is all the content that I have shared with the users of this software of Illustrator in detail for the tutorial on filling color gradient with images, users now see the small editor here. I believe that you are very clear about the filling method, so you can try it by yourself according to the tutorial shared above.