diff --git a/apps/render_data.py b/apps/render_data.py
index b9bbb763..563c03fb 100755
--- a/apps/render_data.py
+++ b/apps/render_data.py
@@ -144,9 +144,9 @@ def rotateBand2(x, R):
 
     return dst
 
-def render_prt_ortho(out_path, folder_name, subject_name, shs, rndr, rndr_uv, angl_step=4, n_light=1, pitch=[0]):
-    cam = Camera(width=512, height=512)
-    cam.ortho_ratio = 0.4
+def render_prt_ortho(out_path, folder_name, subject_name, shs, rndr, rndr_uv, im_size, angl_step=4, n_light=1, pitch=[0]):
+    cam = Camera(width=im_size, height=im_size)
+    cam.ortho_ratio = 0.4 * (512 / im_size)
     cam.near = -100
     cam.far = 100
     cam.sanity_check()
@@ -287,4 +287,4 @@ def render_prt_ortho(out_path, folder_name, subject_name, shs, rndr, rndr_uv, an
     if args.input[-1] == '/':
         args.input = args.input[:-1]
     subject_name = args.input.split('/')[-1][:-4]
-    render_prt_ortho(args.out_dir, args.input, subject_name, shs, rndr, rndr_uv, 1, 1, pitch=[0])
\ No newline at end of file
+    render_prt_ortho(args.out_dir, args.input, subject_name, shs, rndr, rndr_uv, args.size, 1, 1, pitch=[0])
\ No newline at end of file