refactor: change default DPI depending on modes

2 files changed, 13 insertions, 6 deletions

diff --git a/README.md b/README.md
index 91f4867..4763445 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ pip install -r requirements.txt
 # specify output path
 ./src/slidepacker deck.pdf out.pptx
 
-# set render resolution (default: 100 dpi)
+# set render resolution (defaults: 150 dpi standard, 100 dpi with -1)
 ./src/slidepacker deck.pdf --dpi 200
 
 # tune jpeg quality (default: 98)
diff --git a/src/slidepacker b/src/slidepacker
index f445d85..893b97f 100755
--- a/src/slidepacker
+++ b/src/slidepacker
@@ -15,7 +15,8 @@ from pptx.oxml.xmlchemy import OxmlElement
 from pptx.util import Emu
 
 
-DEFAULT_DPI = 100
+DEFAULT_STANDARD_DPI = 150
+DEFAULT_STACKED_DPI = 100
 DEFAULT_JPEG_QUALITY = 98
 
 
@@ -125,7 +126,7 @@ def _add_click_hide_timing(slide, shape_ids):
 def pack(
     pdf_path,
     output_path=None,
-    dpi=DEFAULT_DPI,
+    dpi=None,
     one_slide=False,
     jpeg_quality=DEFAULT_JPEG_QUALITY,
 ):
@@ -134,7 +135,7 @@ def pack(
     args:
         pdf_path:    path to the input pdf
         output_path: path for the output pptx (default: same stem as pdf)
-        dpi:         render resolution (default: 100)
+        dpi:         render resolution (default: 150, or 100 with one_slide)
         one_slide:   if true, stack all pages on one slide with click animations
         jpeg_quality: jpeg quality from 1..100 (default: 98)
 
@@ -145,6 +146,9 @@ def pack(
         base = os.path.splitext(pdf_path)[0]
         output_path = base + ".pptx"
 
+    if dpi is None:
+        dpi = DEFAULT_STACKED_DPI if one_slide else DEFAULT_STANDARD_DPI
+
     if not 1 <= jpeg_quality <= 100:
         raise ValueError("jpeg_quality must be between 1 and 100")
 
@@ -216,9 +220,12 @@ def main():
     parser.add_argument(
         "--dpi",
         type=int,
-        default=DEFAULT_DPI,
+        default=None,
         metavar="N",
-        help=f"render resolution in dpi (default: {DEFAULT_DPI})",
+        help=(
+            "render resolution in dpi "
+            f"(default: {DEFAULT_STANDARD_DPI}, or {DEFAULT_STACKED_DPI} with -1)"
+        ),
     )
     parser.add_argument(
         "--jpeg-quality",