JPEG

Arkadiusz Kubac

CBuilder Developer

Sat, 11 Aug 2001 03:00:00 GMT

BMP->JPEG

Recently I installed jpegpkg.lib library and now I can manipulate jpeg
files, but I have a problem. I read bitmap from TWAIN compatible device and
I'd like to store the file as JPEG file. Simple method:
Image1->Picture->Graphic->SaveToFile("file.jpg");
doesn't get the solution because there is no compression performed (file
has the same size as bitmap file). Are there any routines to compress
bitmap to jpeg.
How can I do that? Thanks in advance.

Ken Moff

CBuilder Developer

Sun, 12 Aug 2001 03:00:00 GMT

Re:BMP->JPEG

Can you Assign the Bitmap->Image->Picture to a TJpegimage and save
that?

On 23 Feb 1999 23:53:38 GMT, "Arkadiusz Kubach" <ar...@ds2.pg.gda.pl>
wrote:

Quote

>Recently I installed jpegpkg.lib library and now I can manipulate jpeg
>files, but I have a problem. I read bitmap from TWAIN compatible device and
>I'd like to store the file as JPEG file. Simple method:
> Image1->Picture->Graphic->SaveToFile("file.jpg");
> doesn't get the solution because there is no compression performed (file
>has the same size as bitmap file). Are there any routines to compress
>bitmap to jpeg.
>How can I do that? Thanks in advance.

Ken Moffat
kmof...@halcyon.com

Arkadiusz Kubac

CBuilder Developer

Sun, 12 Aug 2001 03:00:00 GMT

Re:BMP->JPEG

Ken Moffat <kmof...@halcyon.com> napisa3(a) w artykule
<36d349f7.58298...@forums.borland.com>...
Can you Assign the Bitmap->Image->Picture to a TJpegimage and save
that?

Can you explaine me that more clear?
There was exception when I was doing following:

TJPEGImage *jpegimage;
jpegimage->Assign(Image1->Picture); <---- EAccessViolation Exception
jpegimage->SaveToFile("File.jpg");
I'm begin working with C++ Builder and I probably doing stupid mistakes.
What am I doing wrong?

Ken Moff

CBuilder Developer

Sun, 12 Aug 2001 03:00:00 GMT

Re:BMP->JPEG

Try something like this.
Image1 holds a bmp.

TJPEGImage* J = new TJPEGImage;
J->Assign(Image1->Picture->Graphic);
J->SaveToFile(filename);

On 24 Feb 1999 01:26:14 GMT, "Arkadiusz Kubach" <ar...@ds2.pg.gda.pl>
wrote:

Quote

>Ken Moffat <kmof...@halcyon.com> napisa3(a) w artykule
><36d349f7.58298...@forums.borland.com>...
> Can you Assign the Bitmap->Image->Picture to a TJpegimage and save
> that?

> Can you explaine me that more clear?
> There was exception when I was doing following:

> TJPEGImage *jpegimage;
> jpegimage->Assign(Image1->Picture); <---- EAccessViolation Exception
> jpegimage->SaveToFile("File.jpg");

> I'm begin working with C++ Builder and I probably doing stupid mistakes.
> What am I doing wrong?

Ken Moffat
kmof...@halcyon.com

Claudius Procul

CBuilder Developer

Sun, 12 Aug 2001 03:00:00 GMT

Re:BMP->JPEG

In article <01be5f87$c63f1840$a2aa1...@arkus.ds2.pg.gda.pl>, "Arkadiusz Kubach" <ar...@ds2.pg.gda.pl> wrote:

Quote

>Recently I installed jpegpkg.lib library and now I can manipulate jpeg
>files, but I have a problem. I read bitmap from TWAIN compatible device and
>I'd like to store the file as JPEG file. Simple method:
> Image1->Picture->Graphic->SaveToFile("file.jpg");
> doesn't get the solution because there is no compression performed (file
>has the same size as bitmap file). Are there any routines to compress
>bitmap to jpeg.
>How can I do that? Thanks in advance.

There is C++ source code on www.colosseumbuilders.com to do just that.

John - N8086N
Wise man says "Never use a bank with the initials F. U."
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Troy Moresc

CBuilder Developer

Wed, 15 Aug 2001 03:00:00 GMT

Re:BMP->JPEG

Yep that code works.... I've been doing some cool stuff with it :)

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