BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Help with graphic file task          BorlandTalk.com Forum Index -> Delphi Graphics View previous topic :: View next topic   Author Message Andy Guest Posted: Fri Oct 13, 2006 1:25 pm    Post subject: Help with graphic file task I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone In order to do this, I think I need to reduce the colors so there are not too many shades of gray, black or white but a distinct shade of either gray, black or white. How do I do this? Once that is accomplished, how do I locate the range of colors to do the rest, like changing the color or include/exclude certain colors? If I need any third-party components to do this easily with examples, I would be interested too. I thank you in advance for any help. Andy Back to top James Brown Guest Posted: Fri Oct 13, 2006 10:00 pm    Post subject: Re: Help with graphic file task Take a look at this site: http://www.efg2.com/Lab/ He has a lot of Delphi graphic code with source. Good reference. Regards.. Jim "Andy" <nospam (AT) prizm (DOT) com> wrote in message news:452f4d67$1 (AT) newsgroups (DOT) borland.com... Quote: I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone In order to do this, I think I need to reduce the colors so there are not too many shades of gray, black or white but a distinct shade of either gray, black or white. How do I do this? Once that is accomplished, how do I locate the range of colors to do the rest, like changing the color or include/exclude certain colors? If I need any third-party components to do this easily with examples, I would be interested too. I thank you in advance for any help. Andy Back to top Peter Below (TeamB) Guest Posted: Fri Oct 13, 2006 11:11 pm    Post subject: Re: Help with graphic file task Andy wrote: Quote: I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. Black and white do not have shades, they are *defined* as the colors with no or all bits set in the RGB color space. Gray in this color space is any color that has equal amounts of red, blue, gree set, so there are only 253 shades of gray possible in this color space, strictly speaking (plus black and white). Quote: I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone Alone on what? There has to be a background color. If you can get your image data into a TBitmap, look at the Scanlines property. It gives you direct access to the pixel data. -- Peter Below (TeamB) Don't be a vampire (http://slash7.com/pages/vampires), use the newsgroup archives : http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be Back to top Andy Guest Posted: Sat Oct 14, 2006 3:17 am    Post subject: Re: Help with graphic file task Hi Peter, Thanks for taking the time to respond. Sorry for the ignorance on this. I will try to load it into a TBitmap and muck around the scanlines property. Do I then try to look at each pixel in the scanlines and change the color from there? Thanks again. Andy "Peter Below (TeamB)" <none> wrote in message news:xn0esfhaz1j6ws001 (AT) newsgroups (DOT) borland.com... Quote: Andy wrote: I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. Black and white do not have shades, they are *defined* as the colors with no or all bits set in the RGB color space. Gray in this color space is any color that has equal amounts of red, blue, gree set, so there are only 253 shades of gray possible in this color space, strictly speaking (plus black and white). I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone Alone on what? There has to be a background color. If you can get your image data into a TBitmap, look at the Scanlines property. It gives you direct access to the pixel data. -- Peter Below (TeamB) Don't be a vampire (http://slash7.com/pages/vampires), use the newsgroup archives : http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be Back to top Andy Guest Posted: Sat Oct 14, 2006 3:18 am    Post subject: Re: Help with graphic file task Hi James, Thanks for the tip. Yes, I am aware of that site and have been working on some demos that came from there. Andy "James Brown" <Jim (AT) SETI (DOT) Net> wrote in message news:PCPXg.1713$zy2.1330 (AT) tornado (DOT) socal.rr.com... Quote: Take a look at this site: http://www.efg2.com/Lab/ He has a lot of Delphi graphic code with source. Good reference. Regards.. Jim "Andy" <nospam (AT) prizm (DOT) com> wrote in message news:452f4d67$1 (AT) newsgroups (DOT) borland.com... I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone In order to do this, I think I need to reduce the colors so there are not too many shades of gray, black or white but a distinct shade of either gray, black or white. How do I do this? Once that is accomplished, how do I locate the range of colors to do the rest, like changing the color or include/exclude certain colors? If I need any third-party components to do this easily with examples, I would be interested too. I thank you in advance for any help. Andy Back to top helmut Guest Posted: Sat Oct 14, 2006 8:11 am    Post subject: Re: Help with graphic file task have a look at graphics32 library..its fast and has simple pixel commands so you dont have to mess around with that scanline stuff. http://graphics32.org/wiki/pub/page/Main/HomePage its free too. "Andy" <nospam (AT) prizm (DOT) com> wrote in message news:45301081 (AT) newsgroups (DOT) borland.com... Quote: Hi Peter, Thanks for taking the time to respond. Sorry for the ignorance on this. I will try to load it into a TBitmap and muck around the scanlines property. Do I then try to look at each pixel in the scanlines and change the color from there? Thanks again. Andy "Peter Below (TeamB)" <none> wrote in message news:xn0esfhaz1j6ws001 (AT) newsgroups (DOT) borland.com... Andy wrote: I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. Black and white do not have shades, they are *defined* as the colors with no or all bits set in the RGB color space. Gray in this color space is any color that has equal amounts of red, blue, gree set, so there are only 253 shades of gray possible in this color space, strictly speaking (plus black and white). I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone Alone on what? There has to be a background color. If you can get your image data into a TBitmap, look at the Scanlines property. It gives you direct access to the pixel data. -- Peter Below (TeamB) Don't be a vampire (http://slash7.com/pages/vampires), use the newsgroup archives : http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be Back to top Peter Below (TeamB) Guest Posted: Sat Oct 14, 2006 6:17 pm    Post subject: Re: Help with graphic file task Andy wrote: Quote: Hi Peter, Thanks for taking the time to respond. Sorry for the ignorance on this. I will try to load it into a TBitmap and muck around the scanlines property. Do I then try to look at each pixel in the scanlines and change the color from there? Yes, that is the most direct and usually also the fastest way to manipulate the pixels of a bitmap. Note that the format of the pixel data depends on the PixelFormat of the TBitmap. For pf24bit format each pixel would take 3 consecutive bytes of data, holding a RGBTRIPLE record. -- Peter Below (TeamB) Don't be a vampire (http://slash7.com/pages/vampires), use the newsgroup archives : http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be Back to top Mat Ballard Guest Posted: Mon Oct 16, 2006 4:17 am    Post subject: Re: Help with graphic file task Andy wrote: Quote: I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. It has N shades, where N <= 256. Even in a 24-bit color image, you can only have up to 256 shades of gray. Ergo, you can reduce it to an 8-bit grayscale which is exactly the same, with a palette of 256 shades of gray. To do this, download Anders Melander's TGifImage. A recent version can be found at: http://www.tolderlund.eu/delphi/gifimaged7e.zip To create a 8-bit grayscale from 24-bit "color" use the function: GrayBitmap := GIFImage.ReduceColors(SourceBMP, rmGrayScale, dmNearest, 0, 0); Note that you eventually have to: GrayBitmap.Free; Quote: I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone You need to play with the Colortable: type TRGBQuad = // pf32pixel PACKED RECORD rgbBlue : BYTE; rgbGreen: BYTE; rgbRed : BYTE; rgbReserved: Byte; END; var ColorTable: array [0..255] of TRGBQuad; begin GetDIBColorTable(GrayBitmap.Canvas.Handle, 0, 256, ColorTable); {play around with colors defined in the in ColorTable, then:} SetDIBColorTable(GrayBitmap.Canvas.Handle, 0, 256, ColorTable); {display the result:} MyImage.Picture.Assign(GrayBitmap); end; cheers, Mat Back to top Andy Guest Posted: Wed Oct 18, 2006 1:33 pm    Post subject: Re: Help with graphic file task Hi Helmut, I will definitely take a look at graphics32. Thanks so much for the tip. Andy "helmut" <helmut1000 (AT) gmail (DOT) com> wrote in message news:45308834 (AT) newsgroups (DOT) borland.com... Quote: have a look at graphics32 library..its fast and has simple pixel commands so you dont have to mess around with that scanline stuff. http://graphics32.org/wiki/pub/page/Main/HomePage its free too. "Andy" <nospam (AT) prizm (DOT) com> wrote in message news:45301081 (AT) newsgroups (DOT) borland.com... Hi Peter, Thanks for taking the time to respond. Sorry for the ignorance on this. I will try to load it into a TBitmap and muck around the scanlines property. Do I then try to look at each pixel in the scanlines and change the color from there? Thanks again. Andy "Peter Below (TeamB)" <none> wrote in message news:xn0esfhaz1j6ws001 (AT) newsgroups (DOT) borland.com... Andy wrote: I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. Black and white do not have shades, they are *defined* as the colors with no or all bits set in the RGB color space. Gray in this color space is any color that has equal amounts of red, blue, gree set, so there are only 253 shades of gray possible in this color space, strictly speaking (plus black and white). I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone Alone on what? There has to be a background color. If you can get your image data into a TBitmap, look at the Scanlines property. It gives you direct access to the pixel data. -- Peter Below (TeamB) Don't be a vampire (http://slash7.com/pages/vampires), use the newsgroup archives : http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be Back to top Andy Guest Posted: Wed Oct 18, 2006 1:34 pm    Post subject: Re: Help with graphic file task Hi Peter, Thanks for the tip. Graphics subject is definitely a handful. Andy "Peter Below (TeamB)" <none> wrote in message news:xn0esgo3f8r2ds000 (AT) newsgroups (DOT) borland.com... Quote: Andy wrote: Hi Peter, Thanks for taking the time to respond. Sorry for the ignorance on this. I will try to load it into a TBitmap and muck around the scanlines property. Do I then try to look at each pixel in the scanlines and change the color from there? Yes, that is the most direct and usually also the fastest way to manipulate the pixels of a bitmap. Note that the format of the pixel data depends on the PixelFormat of the TBitmap. For pf24bit format each pixel would take 3 consecutive bytes of data, holding a RGBTRIPLE record. -- Peter Below (TeamB) Don't be a vampire (http://slash7.com/pages/vampires), use the newsgroup archives : http://www.tamaracka.com/search.htm http://groups.google.com http://www.prolix.be Back to top Andy Guest Posted: Wed Oct 18, 2006 1:35 pm    Post subject: Re: Help with graphic file task Hi Mat, Thanks so much for the tip. It was very helpful. I will try to use the TGifImage and see what I can come up with. Thanks again. Andy "Mat Ballard" <mat (AT) chemwares (DOT) com> wrote in message news:4532c181$1 (AT) newsgroups (DOT) borland.com... Quote: Andy wrote: I have an equipment that produces a 24-bit image of a gray background and black or white pixels. Since it is 24-bit, it has many shades of gray, black and white. It has N shades, where N <= 256. Even in a 24-bit color image, you can only have up to 256 shades of gray. Ergo, you can reduce it to an 8-bit grayscale which is exactly the same, with a palette of 256 shades of gray. To do this, download Anders Melander's TGifImage. A recent version can be found at: http://www.tolderlund.eu/delphi/gifimaged7e.zip To create a 8-bit grayscale from 24-bit "color" use the function: GrayBitmap := GIFImage.ReduceColors(SourceBMP, rmGrayScale, dmNearest, 0, 0); Note that you eventually have to: GrayBitmap.Free; I was told to do the following: 1. ability to change the colors gray, black or white to a user-defined color 2. ability to include/exclude the colors independently so as to show the gray, black or white alone You need to play with the Colortable: type TRGBQuad = // pf32pixel PACKED RECORD rgbBlue : BYTE; rgbGreen: BYTE; rgbRed : BYTE; rgbReserved: Byte; END; var ColorTable: array [0..255] of TRGBQuad; begin GetDIBColorTable(GrayBitmap.Canvas.Handle, 0, 256, ColorTable); {play around with colors defined in the in ColorTable, then:} SetDIBColorTable(GrayBitmap.Canvas.Handle, 0, 256, ColorTable); {display the result:} MyImage.Picture.Assign(GrayBitmap); end; 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.