Resize existing image record in Odoo

resize_uploaded_image_in_odoo.py

from openerp import tools

class YourModelName(models.Model):
	_name = 'your.model.name'
	image = fields.Binary(string="Picture",required=True)
	image_name = fields.Char("Picture Name")	


	@api.model
	def create(self,values):
		if 'image' in values:
			# resize uploaded image into 250 X 250
			resize_image = tools.image_resize_image(values['image'], size=(250, 250), avoid_if_small=True)
			values['image'] = resize_image
			return super(YourModelName, self).create(values)

	@api.multi
	def write(self, values):
		if 'image' in values:
			# resize uploaded image into 250 X 250
			resize_image = tools.image_resize_image(values['image'], size=(250, 250), avoid_if_small=True)
			values['image'] = resize_image
			return super(YourModelName, self).write(values)

For details: http://learnopenerp.blogspot.com/2020/07/how-to-resize-image-on-saving-records-in-odoo.html