Narinder, Re: “did you try to re-saving the source PNG image using an external program”
Yes, resaving the PNG using Paint.net made the PNG convert-able to JPG. Good suggestion! I’m guessing the original PNG is a camera photo, and non-standard in some way. Bug 4D does not handle it like Paint.net…. David Ringsmuth From: Narinder Chandi via 4D_Tech Sent: Friday, September 20, 2019 2:57 PM To: 4D iNug Technical Cc: Narinder Chandi Subject: Re: Picture Reduction / Conversion (2) David, Hmm... tricky one to try and troubleshoot over the list. Picking up on your point about trying with Paint.net, did you try to re-saving the source PNG image using an external program, also tweaking the compression or other parameters of the PNG (assuming that is possible...) and then trying to CREATE THUMBNAIL from that? It might help you to narrow down whether the issue is internal compression or not? Regards, Narinder Chandi, ToolBox Systems Ltd. I am available for new consulting opportunities… http://4d.1045681.n5.nabble.com/ANN-4D-Developer-Available-td5765443.html -- -----Original Message----- From: David Ringsmuth <davidi...@gmail.com> Date: Friday, 20 September 2019 at 20:17 To: 4D Tech Mailing List <4d_tech@lists.4d.com> Cc: Narinder Chandi <4dtechmailingl...@toolbox.uk.com> Subject: RE: Picture Reduction / Conversion (2) Narinder, Thanks for asking that question. CONVERT PICTURE($Photo_g;".jpg") PICTURE TO BLOB($Photo_g;$Pict_x;".jpg") BLOB TO PICTURE($Pict_x;$Pict_JPG_g) The new, converted picture size is a couple hundred octets, no longer 244 Ko’s. It appears either as an entire transparent background or a blank picture. Paint.net saves a JPG in 34 KB form 244 KB. I suspect the PNG is compressed somehow and not correctly convertible. David Ringsmuth From: Narinder Chandi via 4D_Tech <mailto:4d_tech@lists.4d.com> Sent: Friday, September 20, 2019 12:35 PM To: 4D Tech Mailing List <mailto:4d_tech@lists.4d.com> Cc: Narinder Chandi <mailto:4dtechmailingl...@toolbox.uk.com> Subject: Re: Picture Reduction / Conversion (2) David, When you say that the "result is an empty picture", does the resulting picture have any bytes and/or dimensions, i.e. did you try checking it with Picture size and PICTURE PROPERTIES commands? I wonder if the issue is with the parameters that you are passing to the CREATE THUMBNAIL command? But then again, I am sure you must have double and triple checked that... Regards, Narinder Chandi, ToolBox Systems Ltd. I am available for new consulting opportunities… http://4d.1045681.n5.nabble.com/ANN-4D-Developer-Available-td5765443.html -- -----Original Message----- From: 4D_Tech <4d_tech-boun...@lists.4d.com> on behalf of 4D Tech Mailing List <4d_tech@lists.4d.com> Reply-To: 4D Tech Mailing List <4d_tech@lists.4d.com> Date: Friday, 20 September 2019 at 18:27 To: 4D Tech Mailing List <4d_tech@lists.4d.com> Cc: David Ringsmuth <davidi...@gmail.com> Subject: Picture Reduction / Conversion (2) 4D v17.4 234574 Windows 10 Home Using Paint.net to open the PNG and save it as a JPG works fine. The resulting JGP is perfect. David Ringsmuth ********************************************************************** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com ********************************************************************** ********************************************************************** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com ********************************************************************** ********************************************************************** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com ********************************************************************** ********************************************************************** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com **********************************************************************
