BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Resizing images?          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message mindsleep Guest Posted: Sun Oct 16, 2005 9:59 am    Post subject: Resizing images? Hi! I have googled the groups on how to resize an image. I need to resize images (PNG, JPEG and GIF) in my program. All i have found are bad ways of doing this, i tried them and the quality of a image when resized is very bad (decreased size). I also found various ways to do this, but in newer Delphi appz (.NET, Delphi 9 etc.) I use Delphi 5, and i need a way to resize the images (decrease). Can someone publish some code on how to do this. Thanx in advance, Mindsleep Back to top theo Guest Posted: Sun Oct 16, 2005 10:44 am    Post subject: Re: Resizing images? mindsleep schrieb: Quote: Hi! I have googled the groups on how to resize an image. I need to resize images (PNG, JPEG and GIF) in my program. All i have found are bad ways of doing this, i tried them and the quality of a image when resized is very bad (decreased size). I also found various ways to do this, but in newer Delphi appz (.NET, Delphi 9 etc.) I use Delphi 5, and i need a way to resize the images (decrease). Can someone publish some code on how to do this. Thanx in advance, Mindsleep You could try the Stretch procedures in http://www.lischke-online.de/GraphicEx.php Back to top Jeremy Darling Guest Posted: Sun Oct 16, 2005 3:28 pm    Post subject: Re: Resizing images? Look at borland.public.attachments for a post called "Bitmap linear resample -> BASM (nt)" by Eric G. It will have everything you need and gives a quality resize. Their are also many topics on this in the borland.public.delphi.language.basm NG with source appearing in the b.p.a group. Jeremy Back to top Mat Ballard Guest Posted: Sun Oct 16, 2005 11:29 pm    Post subject: Re: Resizing images? mindsleep wrote: Quote: I have googled the groups on how to resize an image. I need to resize images (PNG, JPEG and GIF) in my program. All i have found are bad ways of doing this, i tried them and the quality of a image when resized is very bad (decreased size). I also found various ways to do this, but in newer Delphi appz (.NET, Delphi 9 etc.) I use Delphi 5, and i need a way to resize the images (decrease). Can someone publish some code on how to do this. Anders Melander's resample.pas is what you need. Anders' original website is gone, so i've uploaded a copy to nntp:borland.public.attachments cheers, Mat Back to top Herre de Jonge Guest Posted: Mon Oct 17, 2005 8:16 am    Post subject: Re: Resizing images? I always use the GDI+ for this kind of thing. JEDI has a project with a translation of the header files. Also the Microsoft help is somewhere available as .chm (but I don't remember where). Take care, Herre Back to top Renate Schaaf Guest Posted: Mon Oct 17, 2005 7:52 pm    Post subject: Re: Resizing images? In article <4352e1c0$1 (AT) newsgroups (DOT) borland.com>, Mat Ballard wrote: Quote: Anders Melander's resample.pas is what you need. Anders' original website is gone, so i've uploaded a copy to The algorithm isn't quite right. You see it, when the scale target -> source is less than 2. Then it becomes obvious that the averaging weights don't always sum up to 1, causing artificial lines in the result. While this can be easily fixed, Eric Grange (BitmapResample) and Mike Lischke (GraphicEx) got it right for now. I'm working on a fair validation procedure for downsampling algorithms. I'll post something soon in languages.basm and attachments. Help/ideas most welcome, in the end we'll all profit from this. Renate Back to top Joris Van Damme Guest Posted: Tue Oct 18, 2005 11:35 pm    Post subject: Re: Resizing images? Renate Schaaf wrote: Quote: I'm working on a fair validation procedure for downsampling algorithms. If I understand you correctly, I would like to suggest you add the folowing test to your validation procedure: a 180 degrees rotation, of a downsample, of an 180 degrees rotation, of the original, should match the downsample of the original. If there's no match, this means the downsampling algorithm got its coordinate mapping wrong, and thus there's an unwanted shift towards right or left and top or bottom. (Anders' code doesn't pass this test. I don't know about the corrected version from Eric and Mike.) Joris Van Damme [email]info (AT) awaresystems (DOT) be[/email] http://www.awaresystems.be/ Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html Back to top Mat Ballard Guest Posted: Wed Oct 19, 2005 11:22 pm    Post subject: Re: Resizing images? thanks Renate ! i hadn't checked the results of Ander's algorithm sufficiently thoroughly to identify this problem, cheers, Mat Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Graphics All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.