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Date Posted: 10:56:15 04/05/01 Thu
Author: James Fan
Subject: Re: File Size Increase
In reply to: Michel 's message, "Re: File Size Increase" on 06:49:05 04/05/01 Thu

Hi Michel

It's working fine now.
Thanks for your time and thankyou for such a greate Image Library.It's going to make my next project much easier.

James
>
>Hi James,
>
>Yes I remember this issue. The trial DCU has an error
>on setting the tiff compression. The source code has
>been corrected. I have emailed you a new EnTifGr.DCU
>file.
>
>Best regards,
>
>Michel
>
>>Hi Michel
>>
>>I just find out that if I use the pre-complied
>>Demo.exe, everything work fine,I even get a
>>much better compression after I save the tif image,
>>from 38K to 4K.
>>
>>But if I compile and run the trail version, DemoD4
>>project, it doesn't work,the saved tif image
>>file doesn't not compress at all.
>>
>>
>>Here is BeforeSave Event from the trial version.
>>
>>procedure TMainForm.ImageScrollBoxBeforeSave(const
>>Sender: TImageScrollBox;
>> const Graphic: TDibGraphic);
>>begin
>> { This event may be used to set parameters in the
>>Graphic being saved.
>> For example, the compression type in TIF files
>>may be set. }
>> if Graphic is TTiffGraphic then
>> begin
>> if Graphic.ImageFormat = ifTrueColor then
>> TTiffGraphic(Graphic).Compression :=
>tcJPEG
>> else if Graphic.ImageFormat = ifBlackWhite
>then
>> TTiffGraphic(Graphic).Compression :=
>>tcGroup4
>> else
>> TTiffGraphic(Graphic).Compression :=
>>tcPackbits;
>> end;
>>
>> { this code can be used to save transparent png }
>> if Graphic is TPngGraphic then
>> begin
>> (*
>> { a background color may optionally be saved
>>with the PNG file. }
>> TPngGraphic(Graphic).SaveWithBackground :=
>>True;
>> TPngGraphic(Graphic).BackgroundColor :=
>>MakeRgb(0, 255, 0);
>>
>> TPngGraphic(Graphic).SaveTransparent :=
>>True;
>> { for example, use upper left pixel as
>>transparent }
>> TPngGraphic(Graphic).TransparentColor :=
>>TPngGraphic(Graphic).Rgb[0, 0];
>> *)
>> end;
>>
>>end;
>>
>>
>>I use the debugger, trace into this event.
>>Before the statement
>>TTiffGraphic(Graphic).Compression := tcGroup4.
>>The value of TTiffGraphic(Graphic).Compression is
>>tcNone.
>>After the statement TTiffGraphic(Graphic).Compression
>>:= tcGroup4.
>>The value of TTiffGraphic(Graphic).Compression is
>>still tcNone.
>>
>>Is the trail version work differently from liciened
>>version?
>>
>>Thanks in advance
>>
>>James
>>
>>>
>>>Hi James,
>>>
>>>You need to set the compression type in the
>>>ImageScrollBoxBeforeSave event. It should be
>something
>>>like this:
>>>
>>>procedure TMainForm.ImageScrollBoxBeforeSave(const
>>>Sender: TImageScrollBox;
>>> const Graphic: TDibGraphic);
>>>begin
>>> { This event may be used to set parameters in the
>>>Graphic being saved.
>>> For example, the compression type in TIF files
>>>may be set. }
>>> if Graphic is TTiffGraphic then
>>> begin
>>> if Graphic.ImageFormat = ifTrueColor then
>>> TTiffGraphic(Graphic).Compression :=
>>tcJPEG
>>> else if Graphic.ImageFormat = ifBlackWhite
>>then
>>> TTiffGraphic(Graphic).Compression :=
>>>tcGroup4
>>> else
>>> TTiffGraphic(Graphic).Compression :=
>>>tcPackbits;
>>> end;
>>>end;
>>>
>>>I believe some previous did not set the compression
>to
>>>tcGroup4 for black and white images. You may get even
>>>better compression by increasing the RowsPerStrip
>>>property of TTiffGraphic.
>>>
>>>Best regards,
>>>
>>>Michel
>>>
>>>>Hi Michel
>>>>
>>>>Thank you for your reply.
>>>>
>>>>Right after I loaded the tif file (32k), the Format
>>>>Conversion dialog confirm it is Black and White and
>>>>the resolution is 1632 X 2156.
>>>>
>>>>Without any modification or image transform I saved
>>>>the image, the file size is 10 time larger (430k)
>>than
>>>>the original.
>>>>
>>>>Then I loaded the 430k tif file again, the Format
>>>>Conversion dialog confirm it is Blank and White and
>>>>the resolution is 1632 x 2156.
>>>>
>>>>I planning to purchase your image library to create
>>>>multi-page tif file for email, but the file size
>>issue
>>>>need to be resolved.
>>>>
>>>>Here is some more information about the tif file I
>>>>created.
>>>>
>>>>I use a component from TurboPower Software to
>>generate
>>>>the original tif image file then I examined the
>>>>property of this tif image file with the Imaging
>>>>program come with Windows 98, it is Black and White
>>>>with PackBits compression.
>>>>
>>>>I use the same Imaging program to examined the
>>>>property of the tif file saved by the Demo program,
>>it
>>>>is Black and White but there is no compression.
>>>>
>>>>I hope the information is helpful.Thanks in advance.
>>>>
>>>>James
>>>>
>>>>
>>>>>
>>>>>Hi James,
>>>>>
>>>>>Is it possible that you have peformed any image
>>>>>transform before saving? Some transforms need to
>>>>>convert to True Color.
>>>>>
>>>>>Also check the image information by opening the
>>>format
>>>>>conversion dialog box (the grayed format will be
>the
>>>>>current format) before and after the save.
>>>>>
>>>>>Best regards,
>>>>>
>>>>>Michel
>>>>>
>>>>>>I loaded a tif image file,size about 43K in to the
>>>>>>TImageScrollBox. Without any modification, I save
>>>the
>>>>>>image
>>>>>>again. The files size is 10 times larger then the
>>>>>>original
>>>>>>files,its 450K. Any idea what going on here??.
>>>>>>
>>>>>>I using the downloaded Demo program.
>>>>>>
>>>>>>Thanks

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