Re: [ft] a confusing problem when usingFT_Library_SetLcdFilterWeights();

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Dear Werner,
I get real screen snapshots now and I will restate my  problem.
Firstly, pictire1 is the result of a small demo.In the demo I use the LCD 
filter like this.
FT_Library_SetLcdFilter(library, FT_LCD_FILTER_LIGHT);
unsignerd char weight = 0x55;
FT_Library_SetLcdFilterWeights(library, &weight);
The picture2 is the result that I add the text codes in the small demo to our 
spectrum analyzer project program.it seems not working correctly. It is more 
darker than picture1. 
The picture3 is the result that I set the weight = 0x00.The text dispeared. But 
when I set backgroud to other colors, I can see the very dark font.So I think 
it is just more darker than weight = 0x55. 
The picture4 is the result that  I remove the sentence 
FT_Library_SetLcdFilterWeights(library, weight).I can get white font. 
Sincerely,
Zhu GuoLiang

---Original---

From: "Werner LEMBERG"<address@hidden>
Date: Sun, Apr 29, 2018 14:17 PM
To: "r030t1"<address@hidden>;
Cc: "freetype"<address@hidden>;"790687208"<address@hidden>;
Subject: Re: [ft] a confusing problem when 
usingFT_Library_SetLcdFilterWeights();


>> Unfortunately, such hand-held camera snapshots are not very helpful
>> in analyzing your problem.  Can't you simply press the `PrtScr'
>> button to get real screen snapshots that you can further process to
>> get PNG images?
> 
> He mentioned the problem manifests on a spectrum analyzer.  He may
> not have a good way to obtain a screenshot.  I suggest he get one.

Ah, ok.

>> I also suggest that you play around with the `ftview' demo program
>> (which allows full control over LCD weights), also checking its
>> source code.
> 
> Some antialiasing options seem to thin the glyphs, making them
> faint.  I think this is what the OP does not like.  Can you comment
> on this?

It depends on the the right gamma value.  Maybe he is able to make
`ftview' run on WindowsCE (theoretically, it should work).


    Werner

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