From 5e7c12730363a0215feaa15f7a1e019a36e9fd3b Mon Sep 17 00:00:00 2001
From: Taka <taka@vm-linux-dev>
Date: Tue, 2 May 2017 06:25:37 +0000
Subject: [PATCH] Added the ability to change the resolution of extracted
 images.

---
 asl_cards/parse.py                         |  54 ++++++++++-------
 asl_cards/tests/_test_case_base.py         |   5 +-
 asl_cards/tests/synthetic-data/1-card.doc  | Bin 26624 -> 26112 bytes
 asl_cards/tests/synthetic-data/1-card.pdf  | Bin 16133 -> 15736 bytes
 asl_cards/tests/synthetic-data/2-cards.doc | Bin 26624 -> 26624 bytes
 asl_cards/tests/synthetic-data/2-cards.pdf | Bin 16627 -> 16262 bytes
 asl_cards/tests/synthetic-data/3-cards.doc | Bin 27136 -> 27136 bytes
 asl_cards/tests/synthetic-data/3-cards.pdf | Bin 18060 -> 17652 bytes
 startup_widget.py                          |  16 ++++--
 ui/startup_widget.ui                       |  64 ++++++++++++++++++++-
 10 files changed, 108 insertions(+), 31 deletions(-)

diff --git a/asl_cards/parse.py b/asl_cards/parse.py
index fa4983e..e5bd965 100644
--- a/asl_cards/parse.py
+++ b/asl_cards/parse.py
@@ -2,6 +2,8 @@ import sys
 import os
 import re
 import itertools
+import time
+import datetime
 import tempfile
 import locale
 from collections import namedtuple
@@ -84,7 +86,7 @@ class PdfParser:
         self.on_error = on_error # nb: for showing the user an error message
         self.cancelling = False
 
-    def parse( self , target , max_pages=-1 , images=True ) :
+    def parse( self , target , max_pages=-1 , image_res=None ) :
         """Extract the cards from a PDF file."""
         # locate the files we're going to parse
         if os.path.isfile( target ) :
@@ -97,10 +99,11 @@ class PdfParser:
             ]
         # parse each file
         cards = []
+        start_time = time.time()
         for file_no,fname in enumerate(fnames) :
             if self.cancelling : raise AnalyzeCancelledException()
             try :
-                file_cards = self._do_parse_file( float(file_no)/len(fnames) , fname , max_pages , images )
+                file_cards = self._do_parse_file( float(file_no)/len(fnames) , fname , max_pages , image_res )
             except AnalyzeCancelledException as ex :
                 raise
             except Exception as ex :
@@ -118,9 +121,11 @@ class PdfParser:
         self._progress( 1.0 , "Done." )
         # filter out placeholder cards
         cards = [ c for c in cards if c.nationality != "_unused_" and c.name != "_unused_" ]
+        elapsed_time = int( time.time() - start_time )
+        #print( "Elapsed time: {}".format( datetime.timedelta( seconds=elapsed_time ) ) )
         return cards
 
-    def _do_parse_file( self , pval , fname , max_pages , images ) :
+    def _do_parse_file( self , pval , fname , max_pages , image_res ) :
         cards = []
         # check if we have an index for this file
         # NOTE: We originally tried to get the details of each card by parsing the PDF files but unfortunately,
@@ -184,9 +189,9 @@ class PdfParser:
                     if max_pages > 0 and 1+page_no >= max_pages :
                         break
         # extract the card images
-        if images :
+        if image_res :
             self._progress( pval , "Extracting images from {}...".format( os.path.split(fname)[1] ) )
-            card_images = self._extract_images( fname , max_pages )
+            card_images = self._extract_images( fname , max_pages , image_res )
             if len(cards) != len(card_images) :
                 raise RuntimeError(
                     "Card mismatch in {}: found {} cards, {} card images.".format(
@@ -248,17 +253,16 @@ class PdfParser:
             page_pos = page_pos ,
         )
 
-    def _extract_images( self , fname , max_pages ) :
+    def _extract_images( self , fname , max_pages , image_res ) :
         """Extract card images from a file."""
         # clean up any leftover extracted images from a previous run
         # NOTE: It's important we do this, otherwise we might think they're part of this run.
         for f in _find_extracted_image_files() :
             os.unlink( f )
         # extract each page from the PDF as an image
-        resolution = 300 # pixels/inch
         args = [
             "_ignored_" , "-dQUIET" , "-dSAFER" , "-dNOPAUSE" ,
-            "-sDEVICE=png16m" , "-r"+str(resolution) ,
+            "-sDEVICE=png16m" , "-r"+str(image_res) ,
             "-sOutputFile="+_EXTRACTED_IMAGES_FILENAME_TEMPLATE
         ]
         if max_pages > 0 :
@@ -277,7 +281,7 @@ class PdfParser:
             # extract the cards (by splitting the page in half)
             fname2 = list( os.path.split( fname ) )
             fname2[1] = os.path.splitext( fname2[1] )
-            ypos = img_height * 48 / 100
+            ypos = img_height * 48/100 # nb: the cards are not perfectly aligned in the page
             buf1 , size1 = self._crop_image(
                 img , (0,0,img_width,ypos) ,
                 os.path.join( fname2[0] , fname2[1][0]+"a"+fname2[1][1] )
@@ -286,8 +290,11 @@ class PdfParser:
                 img , (0,ypos+1,img_width,img_height) ,
                 os.path.join( fname2[0] , fname2[1][0]+"b"+fname2[1][1] )
             )
-            # check if this is the last page, and it has just 1 card on it
-            if page_no == len(image_fnames)-1 and size1[1] < 1000 and size2[1] < 1000 :
+            if not buf1 and not buf2 :
+                continue # nb: blank page
+            # check if this is the last page, and it has just 1 card (centred) on it (e.g. ItalianOrdnance.pdf)
+            cutoff = img_height / 4
+            if page_no == len(image_fnames)-1 and size1[1] < cutoff and size2[1] < cutoff :
                 # yup - extract it
                 buf , _ = self._crop_image(
                     img , (0,0,img_width,img_height) ,
@@ -295,9 +302,11 @@ class PdfParser:
                 )
                 card_images.append( buf )
             else :
-                # nope - save the extracted cards
-                card_images.append( buf1 )
-                card_images.append( buf2 )
+                # nope - save the extracted card(s)
+                if buf1 :
+                    card_images.append( buf1 )
+                if buf2 :
+                    card_images.append( buf2 )
             # clean up
             os.unlink( fname )
         return card_images
@@ -309,16 +318,19 @@ class PdfParser:
         bgd_col = img.getpixel( (0,0) )
         bgd_img = Image.new( img.mode , img.size , bgd_col )
         diff = ImageChops.difference( rgn , bgd_img )
-        #diff = ImageChops.add(diff, diff, 2.0, -100)
+        diff = ImageChops.add(diff, diff, 2.0, -100)
         bbox = diff.getbbox()
         if bbox :
+            # save the cropped image
             rgn = rgn.crop( bbox )
-        # save the cropped image
-        rgn.save( fname )
-        with open( fname , "rb" ) as fp :
-            buf = fp.read()
-        os.unlink( fname )
-        return buf , rgn.size
+            rgn.save( fname )
+            with open( fname , "rb" ) as fp :
+                buf = fp.read()
+            os.unlink( fname )
+            return buf , rgn.size
+        else :
+            # nb: we get here if the entire region is blank (e.g. the bottom half of a single-card page)
+            return None , None
 
     def _progress( self , pval , msg ) :
         """Call the progress callback."""
diff --git a/asl_cards/tests/_test_case_base.py b/asl_cards/tests/_test_case_base.py
index 12e499b..3ab625c 100755
--- a/asl_cards/tests/_test_case_base.py
+++ b/asl_cards/tests/_test_case_base.py
@@ -21,10 +21,7 @@ class TestCaseBase( unittest.TestCase ) :
             None ,
             #progress = lambda _,msg: print( msg , file=sys.stderr , flush=True )
         )
-        cards = pdf_parser.parse( fname2 , images=False )
-        if False :
-            for c in cards :
-                print(c)
+        cards = pdf_parser.parse( fname2 , image_res=None )
         # check the results
         if len(cards) != len(expected_cards) :
             raise RuntimeError( "{}: got {} cards, expected {}.".format( fname , len(cards) , len(expected_cards) ) )
diff --git a/asl_cards/tests/synthetic-data/1-card.doc b/asl_cards/tests/synthetic-data/1-card.doc
index 5b52de6e802f9231843372bfb5cc93a23176dcc8..a37b9a14ae2e9380bd0601c59906456fa24a52a1 100755
GIT binary patch
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diff --git a/asl_cards/tests/synthetic-data/1-card.pdf b/asl_cards/tests/synthetic-data/1-card.pdf
index 02c8f3baeabd5c414da77b5a20bd8f92865f20c6..fbf2c61bdb10702489372ff862697449f770be20 100755
GIT binary patch
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diff --git a/asl_cards/tests/synthetic-data/2-cards.doc b/asl_cards/tests/synthetic-data/2-cards.doc
index e40958b1702520ce486ebb446e49e494bef9d90c..47c0a5b84a0c8c4149e9909ff89c1296f6f4a650 100755
GIT binary patch
delta 830
zcma)4O-NKx6h7y@H+O98&Ad^^pV4GUO{|4lhBZkJ(I5ml7V{`*<DgO#N-#LY)MhsE
zc9osBfdq->#(WTDQRLP|qMM?P1l6L2P-cdKo%0%9_rdqRd(XZ1obSAQi_2JC#<>O!
zZ91T}Yc|q^(MY4(l*&f{I*?-eL5l0K^BYwF8USpv3jRl%dEb+2fX95WuMQx=^C+i{
z&;_lM7W4#0X<P5cb~<MC;Rf9{Qv6*q9A!l_w{nYg*>^a;#s#HjQv9%rFTq^Nh{K5m
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z-|ZO=2!At?PhDdAxqUwvCFKQghwS>dDl391<}@>1I%n{`%9^5QCn^V}mb53WttLAm
zc4`2Yas`kU1>#Zi2}E`hdJ*?3LD?A{IWAQNyQ+CTalm$CCsU}_HJJPsqkQ~qThX*z
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zG&`0Z9~p*5F9X1FYU}Ol>UnkJ#p@MJa1es(<KB4kW<IyLf;xw#q^Oh=ZE`1i+e4Uk
X-}cXj)mpH?Z_>>TD&z-K$T;dR_VlD`

delta 781
zcma)4OK1~e5T5yWv(3YFH%+n{T1yP6)hbjp*cv2BQIUcsmaHOpF;uiZ4pzK`638v*
zIz4!-9%@k!F?*|r)N>C8PYNO;TD)0{LZw2SNgrnizWx4r{4?L~Y_)~e7S{U|I<#L6
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zJAOSvC2t-p6fk=6C=D8uewi(1NBJ!e(vp$GY1%ZJSaDx>{ZOR*<L)ni5WB$(u*h(H
z0Dm`JjDA7Ou%`;iy#UOU*WQA9)cuW{PpC+Ui|izh-$ZVG>joE5!2A<k<@>)G$Z07V
zV&o}i^%7YrnzsfSWt!JR6g0hbAoL0MG<wbr3^?2-0APvGHk)V>9Uckr`MLOXXJq~I
zhD5m9BR3dV7+w4gwxBb23OH)*W_O|soLXcQw=+5~S8^VDH5%4*09qN1<wT2g6%%Ub
z%qn(f$vimZQ^@hod7J0j%QLE@o%4>HJXJuWt>AMzN#*p}aQuT)>tSrkIL<W*YNex?
za97i}(GWF7q@Q|*=yc1c!$T;+T`2J;A2%}lkiKUuOwr+NDs^FMEZBU9Ic@>{jhDOU
sxP8*(xW-|TC@f=y6Ygww*u<jyCjTO2TzdAEe=+yLbpv_-<x<V~2lz6XO#lD@

diff --git a/asl_cards/tests/synthetic-data/2-cards.pdf b/asl_cards/tests/synthetic-data/2-cards.pdf
index 25ebe1b990cae0860e3a95b87f346ff3a344a00f..d4e9cfb4c64ea86dc4754cf7132dff39b1d59db8 100755
GIT binary patch
delta 2538
zcmc&#dsGu=7B8UU239~$D<aBBngC*wnaL!XkPyQoP(UC&jPjCK0z@SP$ykXNBdFA>
zErn4L0a>jaQ30zcf=8$a#b<T#5sPB66csACP!M4ox9kk!?v`@S?jJp8=a1jqd%t_{
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z`02l~Y3`B@ovy3<tH)d)pE&70R35rLPaf(1k8#V?rnPA=QMU{ivxqgk^34aY_LO`!
zT3Vd9b*ZeuvpZe!trgwxSd-vcH8}UMer`xl6u8wFF?>*Q^PbP1f!<NeR?jcGj)v^(
z2&fwhiM;TuGWb1q)I+Cvd7B0d+v;BCxYaDJ8H{T<UGlz>@!-vpPJU~^`R7)Sm#@7z
z7!KNhHM5ZgN5q}{@N8uOe@<igV$-~!gka5)BJIL^S!(Nsj0O#4d~)o3^zob4Xvo8;
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zcB6cJjs+Z9a{feQ@U6W&TW{AL*l?`8<$A57SKih8Ve&7s?dNw#tuHWMESL2S)hnUs
z+oo@|SkuK9X7rCA1eNwOi=1~pHyRuf=ZG`=ZuixC`B&YM|M=#UzYXp%9*9M%hH96k
zO8E{I`>SODw_@AbI|}_)`%6e-T}F;$OSN}f)V`LBhqcTQ5k4}%k@o3+BD(3jtT{a$
zeQb8$&CNEe@slRgiF*By9k{f1%j$c>X^o1SVg1q5t)q8mnw~J?HRHW&oBnQC`z-k-
zmcTr*>4}7U<n_IZ;_iaiGmMVi!rER>(`u(M7rskx`A^bHV>@O}yWZw-WL$-Q$(5T<
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X>F^{iK9N+2ha#vYjlqzG`P2RhmHUkX

delta 2764
zcmb7G3s@6Z7AAz3V|5j@i(2D=hKDrFBa;UZB9VkQh%v${AckbXP)KYTK#G#J+ATf{
zJA##mqM{V2vK3uc*45Ts1hu%JqCi`*ifDaR1W}7(ZwRl#?zijxX6~H%@44rmd+s^s
zo<A9SHZoSR!=-*4%$<PP^$$Ng01+?>>*5k2kq8OVXi24B^AV|rF(d@W_<US|1Vq6Y
zfpY~g#udgOOJF`CGXY2#;8FlC9?BPsAyTV0ilM*q;u@fJdNLkJ#<&nV)G!`ANWofo
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z_4DAN0?ZG`(8WU359JE^Qi%-XqJ*zh{69F{080!Kt|!yL=@1@5a5^cJQcoFAWeS8s
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zj=7_Bgn&h-2^PJDAXq4wN^o$20wp}TxF@g&O$lAbLsdd|>)|!-3ngzMU+3ZP^#AP0
z8KM8kXT62s2+tREm8XNP2+^zKJ(DzI6Cp{WXsuVT&0y7s!UWyzJv$a7xPtLDA4Ui#
YmQRFGFs95JUnmh{ix&tZ_(Rppuj_QCJ^%m!

diff --git a/asl_cards/tests/synthetic-data/3-cards.doc b/asl_cards/tests/synthetic-data/3-cards.doc
index 28a2d6da28ae70b0252095a395a051df3ddc4c66..a19582de626ebcd2a975654e8947dd7bc223bc76 100755
GIT binary patch
delta 1212
zcma)*OH33&5Qe*F#@S_Mmwn4StAGj~0E4e(B}<GKqpl`wz<5!C2nnDVE*=Qn@S+h~
zq8E)pWqBMV%teJrG#HN(f{Cw#7c@~4Fd80$JN`AhV>Z!)HTkBxtE#K2yJx!Rc=sG1
z%ayn;@}yEp=b~517cJ7D+V5kmjEjK0O$6n@F)yYPW6Tdt@;|x|aWDLg4PfE<EXKl^
z2eIBKPD&o}L=N+ySeN$|MPNf1oA%=M4_ya)P}C{~Zt5acroG~uvbTf+Nd9&w?B*Nc
zXRXJ(%sQQ(ghPkW=u9-0*8Y5!o8i%<zYpnC`!oFv-B9I5=rU+JG7>X?40|RSLQpPr
zaxNo)`Y1R3Mi5@r$$GRtgt@sbQ%{RZHDaR^BnkR(SKB4zf)elKOx`cn)hQm+CM=7R
z;I<>$cblE>v7!Mm3`Rgr8e_M>J@5!jfH=^>#_EsNr3E~zT6y{a7a#2&-__ha##Db(
zq;QL&>rcO8wm!$ac;m2(+e(hGXRP=}k@z!M1`-mv!7h>I%&|o=ss(jvqRV+mTys`{
zZ1KRIEj~c6I9$T(TG(BOkQ?AW7z2~wHCO{b!8+Igzd)kflyr8as~1_GPdt6xd$_1r
z#|>^q6Ld<(-J&bn-X=0&OvgY4b<uWUxoa3kVhwPtjDd%M<Eypc-YiT>Y8sOaff101
zATP-vAWuBGR>A*5J`{pB3bT1=5;VZ*KykR@WpHblI;LzS7&1L9cXOjF>Wo=SBo4bV
z#?;i3lbjG;+gTam>Y~K%ehrAuP}#w9>y=ElG=r2)l#lt|*7UU7qdVNtR-^n;ST*=0
zqoBg%>oP2cRr?Y;#r<yjq*H|U73cWhs>IEznG6eSVa==+bg)L&fDgKDJe<j0EzPaX
z9gPhvA4_T5`$cheMMY@x!sDm2JWTl<>ia+AJD!D$_~WQFZQpExw5Ih|muB#|_Uy!{
VOAQoE;osCQol`l!@XPf*>Ti|q-^>62

delta 1152
zcma)+OGs2<6vxkZXS|NeI1gtgEt{;yd{C)mnU7=!av_=;JuF(88=(l27P&BmFk5P8
z5v>XXu^KAo27w0Bx`k3MDk55_Nt+Zb#>dR`KQnVnYSS5h_nhyX^PTTKgL7(dPCYNw
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z*2^cgJf5@!m7g~(HN}VELmGwCwg1-V;6KQn*1c|-#a0P>c*T08ToOe74X6C(7wKKL
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zZd;Hb^Qbc8$s~M2>G7ohQMAovnL5n%dV99)porg#v)ZSj78HN9<f}g3(5KaqF_rmU
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diff --git a/asl_cards/tests/synthetic-data/3-cards.pdf b/asl_cards/tests/synthetic-data/3-cards.pdf
index 65a3e16f2db44278e857f34ab82d642912b9a784..677bb4b4078d728f981bf12dcdc43bf2c78c2b45 100755
GIT binary patch
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diff --git a/startup_widget.py b/startup_widget.py
index 2ffebd8..fa63921 100644
--- a/startup_widget.py
+++ b/startup_widget.py
@@ -20,10 +20,11 @@ class AnalyzeThread( QThread ) :
     progress2_signal = pyqtSignal( float , name="progress2" )
     completed_signal = pyqtSignal( str , name="completed" )
 
-    def __init__( self , cards_dir , db_fname ) :
+    def __init__( self , cards_dir , image_res , db_fname ) :
         # initialize
-        super(AnalyzeThread,self).__init__()
+        super().__init__()
         self.cards_dir = cards_dir
+        self.image_res = image_res
         self.db_fname = db_fname
 
     def run( self ) :
@@ -40,7 +41,7 @@ class AnalyzeThread( QThread ) :
                 on_ask = self.on_ask ,
                 on_error = self.on_error ,
             )
-            cards = self.parser.parse( self.cards_dir )
+            cards = self.parser.parse( self.cards_dir , image_res=self.image_res )
             if not cards :
                 raise RuntimeError( "No cards were found." )
             db.open_database( self.db_fname , True )
@@ -137,6 +138,10 @@ class StartupWidget( QWidget ) :
         )
         self.btn_load_db.setText( " " + self.btn_load_db.text() )
         # load the widget
+        self.cbo_resolution.addItem( "150 dpi" )
+        self.cbo_resolution.addItem( "300 dpi" )
+        self.cbo_resolution.addItem( "600 dpi" )
+        self.cbo_resolution.setCurrentIndex( 1 )
         if os.path.isfile( db_fname ) :
             self.le_load_db_fname.setText( db_fname )
         else :
@@ -187,6 +192,8 @@ class StartupWidget( QWidget ) :
             MainWindow.show_error_msg( "Please choose where you want to save the results." )
             self.le_save_db_fname.setFocus()
             return
+        # unload other settings
+        image_res = int( self.cbo_resolution.currentText().split()[ 0 ] )
         # run the analysis (in a worker thread)
         self.frm_open_db.hide()
         self.frm_analyze_progress.show()
@@ -194,7 +201,7 @@ class StartupWidget( QWidget ) :
         self._update_analyze_ui( False )
         self.btn_cancel_analyze.setEnabled( True )
         self.btn_cancel_analyze.clicked.connect( self.on_cancel_analyze )
-        self.analyze_thread = AnalyzeThread( cards_dir , fname )
+        self.analyze_thread = AnalyzeThread( cards_dir , image_res , fname )
         self.analyze_thread.progress_signal.connect( self.on_analyze_progress )
         self.analyze_thread.progress2_signal.connect( self.on_analyze_progress2 )
         self.analyze_thread.completed_signal.connect( self.on_analyze_completed )
@@ -252,6 +259,7 @@ class StartupWidget( QWidget ) :
     def _update_analyze_ui( self , enable ) :
         # update the UI
         widgets = [ self.lbl_cards_dir , self.le_cards_dir, self.btn_cards_dir ]
+        widgets.extend( [ self.lbl_resolution , self.cbo_resolution , self.lbl_resolution_hint ] )
         widgets.extend( [ self.lbl_save_db_fname , self.le_save_db_fname , self.btn_save_db_fname ] )
         widgets.append( self.btn_analyze )
         for w in widgets :
diff --git a/ui/startup_widget.ui b/ui/startup_widget.ui
index b74cec4..5addfc1 100644
--- a/ui/startup_widget.ui
+++ b/ui/startup_widget.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>592</width>
-    <height>418</height>
+    <height>471</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_5">
@@ -64,7 +64,7 @@
           <number>2</number>
          </property>
          <property name="leftMargin">
-          <number>8</number>
+          <number>0</number>
          </property>
          <property name="topMargin">
           <number>0</number>
@@ -263,6 +263,65 @@
            </layout>
           </widget>
          </item>
+         <item>
+          <layout class="QHBoxLayout" name="horizontalLayout_8">
+           <property name="spacing">
+            <number>0</number>
+           </property>
+           <item>
+            <widget class="QLabel" name="lbl_resolution">
+             <property name="text">
+              <string>&amp;Resolution:  </string>
+             </property>
+             <property name="buddy">
+              <cstring>cbo_resolution</cstring>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <widget class="QComboBox" name="cbo_resolution">
+             <property name="minimumSize">
+              <size>
+               <width>80</width>
+               <height>0</height>
+              </size>
+             </property>
+             <property name="maximumSize">
+              <size>
+               <width>80</width>
+               <height>16777215</height>
+              </size>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <widget class="QLabel" name="lbl_resolution_hint">
+             <property name="font">
+              <font>
+               <pointsize>8</pointsize>
+               <italic>true</italic>
+              </font>
+             </property>
+             <property name="text">
+              <string>  (higher values are slower, but look better)</string>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <spacer name="horizontalSpacer_3">
+             <property name="orientation">
+              <enum>Qt::Horizontal</enum>
+             </property>
+             <property name="sizeHint" stdset="0">
+              <size>
+               <width>40</width>
+               <height>20</height>
+              </size>
+             </property>
+            </spacer>
+           </item>
+          </layout>
+         </item>
          <item>
           <widget class="QWidget" name="widget_3" native="true">
            <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -654,6 +713,7 @@
  <tabstops>
   <tabstop>le_cards_dir</tabstop>
   <tabstop>btn_cards_dir</tabstop>
+  <tabstop>cbo_resolution</tabstop>
   <tabstop>le_save_db_fname</tabstop>
   <tabstop>btn_save_db_fname</tabstop>
   <tabstop>btn_analyze</tabstop>