fix #4272: trackable image is too small
fix #4272: trackable image is too small

vishwakulkarni/cgeo,Bananeweizen/cgeo,pstorch/cgeo,KublaikhanGeek/cgeo,KublaikhanGeek/cgeo,kumy/cgeo,mucek4/cgeo,pstorch/cgeo,S-Bartfast/cgeo,schwabe/cgeo,SammysHP/cgeo,pstorch/cgeo,Bananeweizen/cgeo,tobiasge/cgeo,vishwakulkarni/cgeo,cgeo/cgeo,brok85/cgeo,matej116/cgeo,brok85/cgeo,matej116/cgeo,brok85/cgeo,rsudev/c-geo-opensource,xiaoyanit/cgeo,KublaikhanGeek/cgeo,Huertix/cgeo,mucek4/cgeo,Bananeweizen/cgeo,mucek4/cgeo,madankb/cgeo,superspindel/cgeo,S-Bartfast/cgeo,auricgoldfinger/cgeo,marco-dev/c-geo-opensource,cgeo/cgeo,samueltardieu/cgeo,matej116/cgeo,ThibaultR/cgeo,cgeo/cgeo,schwabe/cgeo,kumy/cgeo,yummy222/cgeo,lewurm/cgeo,vishwakulkarni/cgeo,cgeo/cgeo,ThibaultR/cgeo,marco-dev/c-geo-opensource,lewurm/cgeo,rsudev/c-geo-opensource,auricgoldfinger/cgeo,Huertix/cgeo,xiaoyanit/cgeo,yummy222/cgeo,ThibaultR/cgeo,rsudev/c-geo-opensource,schwabe/cgeo,S-Bartfast/cgeo,yummy222/cgeo,superspindel/cgeo,schwabe/cgeo,Huertix/cgeo,samueltardieu/cgeo,SammysHP/cgeo,xiaoyanit/cgeo,tobiasge/cgeo,samueltardieu/cgeo,madankb/cgeo,madankb/cgeo,lewurm/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,SammysHP/cgeo,kumy/cgeo,superspindel/cgeo,marco-dev/c-geo-opensource