BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Timage Transparent          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Usage) View previous topic :: View next topic   Author Message Alain Guest Posted: Mon Sep 11, 2006 8:10 am    Post subject: Timage Transparent Hello All, I placed several TImage components over each other each containing the JPEG image of a T-Shirt of a different color. The last TImage component is the design that is to be printed on the chest position of the tshirt and it's property is set transparent. The quality of the transparent image deteriorates. Which format must I use to get a good quality because if tranparent of the TImage is set true I get the limits of the TImage Thanks Alain Back to top Clayton Arends Guest Posted: Mon Sep 11, 2006 9:52 pm    Post subject: Re: Timage Transparent JPEG is a lossy compression which uses a resonably close colors to the original image but it won't necessarily be the same. Because of this you get artifacts all over the place (as you have found out). BMP is probably the easiest for you to use to correct this scenario. However, GIF is a little better since it offers image compression. Personally, I use nothing but PNG since it offers multiple levels of transparency with true-color images. To download a good PNG component for the VCL head to: http://sourceforge.net/projects/pngdelphi - Clayton Back to top Alain Guest Posted: Tue Sep 12, 2006 8:11 am    Post subject: Re: Timage Transparent Quote: To download a good PNG component for the VCL head to: http://sourceforge.net/projects/pngdelphi Getting EInvalidGraphic when I DESIGN->Picture->LoadFromFile(FileListBox1->FileName); for image file with .png extension Back to top Alain Guest Posted: Tue Sep 12, 2006 8:11 am    Post subject: Re: Timage Transparent I have been able to install the PNG package But still can't remove the JPEG error. How can I identify which components need to be register so that I may remove them safely ? Thanks Back to top Alain Guest Posted: Tue Sep 12, 2006 8:11 am    Post subject: Re: Timage Transparent Quote: To download a good PNG component for the VCL head to: http://sourceforge.net/projects/pngdelphi - Clayton How to use Delphi *.pas codes under C++Builder 4 ? Thanks Back to top Clayton Arends Guest Posted: Tue Sep 12, 2006 9:00 pm    Post subject: Re: Timage Transparent You need to have the following line in one of your CPP files: #pragma link "PNGImage" - Clayton Back to top Clayton Arends Guest Posted: Tue Sep 12, 2006 9:05 pm    Post subject: Re: Timage Transparent "Alain" <alainbastien (AT) gmail (DOT) com> wrote in message news:45063fb8 (AT) newsgroups (DOT) borland.com... Quote: But still can't remove the JPEG error. What error? Are you referring to the transparent quality of the JPEGs? If so, did you convert to PNG from the JPEG or from an original clear source (such as BMP or TIFF)? Can you post to the "attachments" group an example of one of the images that is giving you a problem? It also wouldn't hurt to post a screen shot of the problem you are having. - Clayton Back to top Alain Guest Posted: Wed Sep 13, 2006 8:11 am    Post subject: Re: Timage Transparent Quote: #pragma link "PNGImage" - Clayton Done ..My *.png files open And the transparency is GREAT as expected Now I must work out the proportion resizing Thanks again Alain Back to top Alain Guest Posted: Wed Sep 13, 2006 8:11 am    Post subject: Re: Timage Transparent To Clayton: The PNG works great !! I wonder How can such application can be done for the WEB ? My I sent it (the compile or source) to you as attachement so that you can redirect me to the appropriate group to get it web based? at least a starting point Thanks Alain Back to top Clayton Arends Guest Posted: Wed Sep 13, 2006 10:30 pm    Post subject: Re: Timage Transparent I haven't yet made any of my applications run from within a web browser so I cannot help you there. Most likely you will need to make an ActiveX control but that will limit those who use your product to Internet Explorer users (and a few other various browsers) on the Windows platform. You can try asking your question in the "vcl.components.writing" newsgroup or ask a general question in the "non-technical" group. Good luck, - Clayton Back to top Alain Guest Posted: Wed Oct 11, 2006 12:45 pm    Post subject: Re: Timage Transparent Hello All, Is it possible to control the transparency of a PNG image loaded on a TImage using a Trackbar component ? Thanks Alain Back to top Alain Guest Posted: Mon Oct 16, 2006 1:41 pm    Post subject: Re: Timage Transparent "Alain" <alainbastien (AT) gmail (DOT) com> wrote in message news:452caf32 (AT) newsgroups (DOT) borland.com... Quote: Hello All, Is it possible to control the transparency of a PNG image loaded on a TImage using a Trackbar component ? Thanks Alain This is from Michel Leunen Here is how to change the amount of transparency of an image and draw it on a TImage. All the work is done in a TButton event handler here. I leave to you the part with the trackbar. You just have to slightly change the code to be used in the OnChange event of the trackbar. void __fastcall TForm1::Button1Click(TObject *Sender) { Graphics::TBitmap* SourceBmp = new Graphics::TBitmap(); Graphics::TBitmap* DestBmp = new Graphics::TBitmap(); SourceBmp->LoadFromFile("your_image.bmp"); DestBmp->PixelFormat = pf24bit; DestBmp->Width = SourceBmp->Width; DestBmp->Height = SourceBmp->Height; /* alpha gives the amount of transparency. * 1.0 completely transparent * 0.0 no transparency */ const float alpha = 0.8; for(int row = 0; row < SourceBmp->Height; row++) { RGBTRIPLE* source = static_cast<RGBTRIPLE*>(SourceBmp->ScanLine[row]); RGBTRIPLE* dest = static_cast<RGBTRIPLE*>(DestBmp->ScanLine[row]); for(int col = 0; col < SourceBmp->Width; col++) { dest->rgbtRed = alpha * dest->rgbtRed + (1-alpha) * source->rgbtRed; dest->rgbtGreen = alpha * dest->rgbtGreen + (1-alpha) * source->rgbtGreen; dest->rgbtBlue = alpha * dest->rgbtBlue + (1-alpha) * source->rgbtBlue; source++; dest++; } } Image1->Picture->Assign(DestBmp); delete SourceBmp; delete DestBmp; } Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> C++ Builder (VCL Components Usage) 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.