Output squashed at certain output widths

I noticed this issue in Letterpress, where an image gets squashed vertically or horizontally when converting to ASCII. I couldn't really find a patter, different images seem to get squashed at different sizes.

Cube

I found this image gets especially squashed from the side at sizes above 200.

Phone

I found this image gets squashed vertically at sizes below 100 and from 130-160, and squashed from the side at sizes above 170.

[FineFindus]

Could you please add an example of how to recreate the problem directly with artem, as well as run the command with --verbose trace and include its log output here.

I ran it on the Cube image, here's the output.

Details

gregorni@fedora /v/h/g/D/artem-v3.0.0-x86_64-unknown-linux-gnu> ./artem ~/Pictures/Cube.jpg --size=150 --verbose trace
[TRACE] Started logger with trace
[TRACE] Feature web_image: true
[INFO ] Checking inputs
[DEBUG] Input /home/gregorni/Pictures/Cube.jpg is a file
[DEBUG] Using default characters
[DEBUG] Characters used: 'MWNXK0Okxdolc:;,'...   '
[TRACE] Using user input size as target size
[DEBUG] Target Size: 150
[DEBUG] Scale: 0.42
[DEBUG] Invert is set to: false
[DEBUG] BackgroundColor is set to: false
[INFO ] Using colored ascii
[INFO ] Using truecolor ascii
[INFO ] Using border: false
[DEBUG] Flipping X-Axis: false
[DEBUG] Flipping Y-Axis: false
[DEBUG] Centering X-Axis: false
[DEBUG] Center Y-Axis: false
[DEBUG] Outline: false
[DEBUG] Target: Shell
[INFO ] Opening image
[DEBUG] Using inverted color: false
[DEBUG] Input Image Width: 1920
[DEBUG] Input Image Height: 1219
[DEBUG] Columns: 150
[DEBUG] Rows: 43
[DEBUG] Tile Width: 12
[DEBUG] Tile Height: 28
[INFO ] Resizing image to fit new dimensions
[DEBUG] Resized Image Width: 1800
[DEBUG] Resized Image Height: 1204
[TRACE] Created output string
[TRACE] Calculating horizontal spacing
[INFO ] Starting conversion to ascii
[INFO ] Printing output
                                                                                                                                                      
                                                                            :dOd.                                                                     
                                                                       .:dOXNNNKd:                                                                    
                                                                   .cx0XNNNNNNNXxdo,                                                                  
                                                               .cx0XXNNXK0kxNNNNkdddl.                                                                
                                                           'lx0XNXXXK0kdddolXNNNKdlddd:.                                                              
                                                       'lkKXXNXXKOkddddoc,. ONNNNxo;dxdo;                                                             
                                                   ,okKXXXXXKOxddddl:,.     oNNNNOd,;ddddl.                                                           
                                               ;okKXXXXK0Oxxddol:'        .':NNNNKdl,d:odddc.                                                         
                                           ;oOKXXXXK0kxdddoc;. ..,;:clodxxxxdKNNNNxd,lc:odddo;                                                        
                                       ;dOKXXXXK0kxdddoolccloddxxxxxddddoooolONNNNOd::cc;oddddo'                                                      
                                    ,OXXXXX0Okxxxdloooodddddddoooooollc::;,'.;NNNNKdl:,lc;odddddc.                                                    
                                    :XXXOoloool:' ,odl:clollccccc:;,,''''.....KNNNNxd:':l:'loodddd:                                                   
                                    ;XXXO::cccc;. odd;,:;'  'cc;clllllllllllllONNNNOdc.'cl; ,ooooodo'                                                 
                                    'XXXOlccoolclcxxo;'lc;,,cc',,''';:;;;;;;;;oNNNNKdl','lc;'ddlllodo                                                 
                                    .XXX0ll:doooldxxc;.llcclc'.:;..,,':::;,'.. XNNNNxd,'''lc;;dlxxkOd,                                                
                                     XXXKll,'coodxkx;,.'cllc'..c:;,.',..';;;:::ONNNWOd;.'.;lc,,:dOO0kl                                                
                                     XXXXol;   ,xkkl;''cooc'.';:,...;'...';'.cdkNWWWXxl....:l:. ;0000d.                                               
                                     KXXXol:   'kkk:;';odc',::,.;,,.'......;c;,cNWWWNxd... .cc;. k000xc                                               
                                     0XNNolc   okOo;',ddc':llc:::::;;,'....,'',cXWWWWOx;....'c:,.cOO0Od.                                              
                                     0NNNdlc  .kOO:,,ddl;;:c;cclllccc:;,.....',o0WWWWXxl.....;l:..kOO0x:                                              
                                     OXNNxlc  oOOd;;dddddddddddooooooollcc;,,,ldkWWWWWxd.....,dc. oOO0ko                                              
                                     kNNNxll .kOOc:.cllccllloooooooooddddxxxxxxxxXWWWWOx:.. ..d:. ,O000d,                                             
                                     xNNNklc.lO0x:, .cl:::ododxkkOOOOOOOkkkkk0KXNWWWWWXxdc. ..c;.  k000kl                                             
                                     xNNNklc.O00kkkkO00000000OOOkkxxxddxO0XNWWWWWWWWNXKkxxdc,.,;   cO000d.                                            
                                     xNNNOlco000OOOOkkkxxxddoooooldk0KNWWWWWWWWNXK0OOOOOOkxxdl;'    O000xc                                            
                                     dNNN0oc:looooollccc:;;,';ok0NWWWWWWWWNXK0OOOkxolxOOOOOkxddo,   d000Od.                                           
                                     oNNNKol; :lll;;,  :ldk0XNNNWWWWNNXK0OOOkdlc;..;loodkOkkkkxddo; ,0000x:                                           
                                     lNNNKol:  'cllldk0XNNNNNNWNXXK0OOOkdl:,.. ':c,.lddo:oxkkkkkxddd:lO00Oo                                           
                                     :NNNXllc .cxKXNNNNNNNNXK0OOOOxdl:..   ,;...oo:.;oddd:;;dkkkkkxxddldO0d;                                          
                                     ;NNNXxO0XNNNNNNNNXK0OOOkxoc;.... ..,cclc'. ldl';,cdddc;;ddkkkkkxxddokkl                                          
                                     'NNNNNNNNNNNXK0Okkkxoc;......,;:cllccclc:;;cdd;,. :xxdc;c;.:dkkkkkxdddd'                                         
                                     .NNNNNNXK0Okkkdl:;,,'....,',;;:::cclooooooolddl'..'cxxxc;;   ,xkkkkkxddl                                         
                                      XXK0Okkkxol:,,.  .cll::co,,kkc:.',,;:clooooooolxxxddxxxl;cxkOOOkkkkkkxd.                                        
                                      .:oxkkkkxdoolllc;..:clc;:lodddddddxxxxxxxxxxxxxxxxxxxxxdck0000OOkkkxdoc.                                        
                                          .:okkkkkxdollll::cc:cloooooooooooolllcccooddxxxxxkkO00OOkkxoc;'                                             
                                              'cdkkkkxdoolllcc;,cclc:,..    ':ldkOO000000OOOkkxol:'                                                   
                                                  ,cdkkkkxdolllldxkxc:.;ldxOO000000OOOkkxol:,.                                                        
                                                     .;ldkkkxdoollccdkkOOO000OOOkkxdl:,.                                                              
                                                         .:oxkkxxdl:dkOOOOkkxdlc,.                                                                    
                                                             .:oxxxxxkxdlc;.                                                                          
                                                                 'cc;.                                                                                
                                                                                                                                                      
gregorni@fedora /v/h/g/D/artem-v3.0.0-x86_64-unknown-linux-gnu>