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

[suzuki toshiya]

All screenshots are too small to figure what the demo is...
Any of them is ftview result?

On 5/2/2018 6:38 PM, 哈尔滨工程大学 朱国梁 wrote:
> 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
>