how to change the dimensions of a jpg image in R?

Question

I always resized images in CorelDraw from 1219,20 x 914,40mm to 78.36x51.00 to make photo boards. But now it turns out I have a lot of images in different folders and I needed to create an auto-lop to do this for me. If I were to do this in Corel like I used to do, it would take a lot of time. I have used the the resize function from Magick package, but didn't have obtain sucess.

resize(Image,  "78.36x51.00!")

Error in resize("78,36x51,00!") : 
Not compatible with requested type: [type=character; target=integer].

So I also tried the image_scale function, in this case the dimensions changed, but the size and resolution of the image was much smaller than expected.

 image_scale(Image, "78.36x51.00!")

  

• Demonstration with the generated image after the resize (photo) and the expected size (white square)