@@ -148,7 +148,7 @@ class PngRenderer(ImageRenderer):
148148 mime type: 'image/png'
149149 """
150150
151- def __init__ (self , width = None , height = None , scale = None , engine = "auto" ):
151+ def __init__ (self , width = None , height = None , scale = None , engine = None ):
152152 super (PngRenderer , self ).__init__ (
153153 mime_type = "image/png" ,
154154 b64_encode = True ,
@@ -170,7 +170,7 @@ class SvgRenderer(ImageRenderer):
170170 mime type: 'image/svg+xml'
171171 """
172172
173- def __init__ (self , width = None , height = None , scale = None , engine = "auto" ):
173+ def __init__ (self , width = None , height = None , scale = None , engine = None ):
174174 super (SvgRenderer , self ).__init__ (
175175 mime_type = "image/svg+xml" ,
176176 b64_encode = False ,
@@ -192,7 +192,7 @@ class JpegRenderer(ImageRenderer):
192192 mime type: 'image/jpeg'
193193 """
194194
195- def __init__ (self , width = None , height = None , scale = None , engine = "auto" ):
195+ def __init__ (self , width = None , height = None , scale = None , engine = None ):
196196 super (JpegRenderer , self ).__init__ (
197197 mime_type = "image/jpeg" ,
198198 b64_encode = True ,
@@ -213,7 +213,7 @@ class PdfRenderer(ImageRenderer):
213213 mime type: 'application/pdf'
214214 """
215215
216- def __init__ (self , width = None , height = None , scale = None , engine = "auto" ):
216+ def __init__ (self , width = None , height = None , scale = None , engine = None ):
217217 super (PdfRenderer , self ).__init__ (
218218 mime_type = "application/pdf" ,
219219 b64_encode = True ,
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