Re: Color difference between old and new application - C / C++ / MFC Discussion Boards

How to use C to make a Mathematical / Statistical compiler for my final year project. i need help. Need someone that will put me through all the steps to achieve this project of mine. i havent actually seen any recent work on it. Thanks

Because most of the compilers that are being written are either commercial, such as for Visual Studio or are open source and mostly people think open source is a synonym for buggy.

The compilers are just the translators used to translate the language or framework in machine language (let us skip the byte code for moment), so you need to write a back-end code that actually translates the high-level code in a low-level code such as machine code or assembly language. For mathematical expressions, the term is known as Mathematics Parsers. Have a look at this thread and give a look at the answers.

http://stackoverflow.com/questions/4892152/what-is-a-fast-c-or-objective-c-math-parser[^].
http://stackoverflow.com/questions/11703082/parsing-math-expression-in-c-c[^]

There is an algorithm used to create mathematical expression parser, Shunting-yard algorithm[^] (second link above)

At the end, please give this thread a look: http://programmers.stackexchange.com/questions/244362/parsing-mathematical-expressions-with-two-values-that-have-parentheses-and-minus[^]. The rest is left to you, we won't guide you throughout each step, you have to do that. If you stumble upon any problem do let us know we will help you to continue. Smile | :)

The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~

Member 11942996 wrote:
How to use C to make a Mathematical / Statistical compiler for my final year project.

So what in the world have you been doing prior to this? Confused | :confused:

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

0
down vote
favorite I have seen CPU scheduling algorithms (Rate monolithic - Real time CPU scheduling) or priority scheduling using array data structure

http://c-programmingguide.blogspot.in/2012/09/c-program-for-rate-monotonic-scheduling.html

But I would like to know if this is the preferred data structure if yes why OR if any data struture is preferred for RMS then which one is better and why

any suggestions would be appreciated

Thanks in advance

Hello Everybody,

We have an application which is created in VC++ 6.0 version, in that we are displaying some colors (Pantone color) reading the colors from text file and displaying.

When I use the same text file (with same color details), in Visual Studio 2008 or higher, the application is displaying different color (actual color is this)

For example,
Original RGB is 198, 93, 82

Using color picker, for old application, its giving RGB as 120, 27, 20 and in the new application it shows 198, 93 and 82.

Will there be any color variation between old and new applications (visual studios)?

Thanks in advance,
A. Gopinath.

Howdy, I'm not so sure I understand your question.

rgb(198,93,82) looks like This , while rgb(120,27,20) looks like This

Obviously, these 2 colours are not only very different in terms of their RGB values and their HSL values for that matter, but they also appear very different to anyone not unfortunate enough to be hit with R-G colour blindness. Aren't you actually telling us yourself that the colours appear differently?

Their pantone numbers are also very different, 180 U vs 1815 C

I can't help but wondering 3 things:

1) What is the format of the input in the text-file and the exact input that produces these colours?
2) How is this being transformed into a colour by your application?
3) What difference did you find when you stepped through the conversion process in your debugger in each of the versions of the application?

I'm not familiar with the conversion process between rgb <--> pantone to know if a small difference in precision could produce such a wildly different result, or if it's an integer-only process that could suffer from a signed/unsigned error. Showing the input and the way it results in a final colour could well help, though it may not.

"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon

Hello,

Thanks for your reply.
This is the format in text file in which pantone color details are written.

PANTONE Number Name L* a* b* sR sG sB
PANTONE 11-0103 TCX Egret 93.74 1.19 6.78 243 236 224
PANTONE 11-0602 TCX Snow White 94.93 0.1 2.67 242 240 235
PANTONE 11-0601 TCX Bright White 96.21 -0.44 1.61 244 245 240

The value which I gave previously is

PANTONE 17-1544 TCX Burnt Sienna 53.75 43.63 28.62 198 93 82

In the new application, on a color button (CColorBtn), i am displaying the colors.

In the old application, they are loading this L, a and b values, converting into color values. for this, they are using some third party, i am not able to go depth in that. color is displayed on some other control, not on button in old application.

Regards,
A. Gopinath.

Ahhhhh! What you say about them reading in the L-a-b values may very well be the key here - unless of course, it is the exact same library performing the colour-space transformation each time.

I mean, the RGB values are also available in each line and as far as a colour-picker is concerned, are entirely unambiguous. While different monitors/printers may display the same RGB value in a way that appears differently to our eyes and would produce different RGB values if a photograph of the results are compared.

However, the first paragraph from the wikipedia page on Lab color space[^] may possibly hold the key to the different results. It says:

A Lab color space is a color-opponent space with dimension L for lightness and a and b for the
color-opponent dimensions, based on nonlinearly compressed (e.g. CIE XYZ color space) coordinates.
The terminology originates from the three dimensions of the Hunter 1948 color space, which are L,
a, and b.[1][2] However, Lab is now more often used as an informal abbreviation for the L-a-b
representation of the CIE 1976 color space (or CIELAB, described below). The difference between
the original Hunter and CIE color coordinates is that the CIE coordinates are based on a cube root
transformation of the color data, while the Hunter coordinates are based on a square root
transformation. Other examples of color spaces with Lab representations include the CIE 1994
color space and the CIE 2000 color space.
(emphasis mine)

Reading on further, I was reminded that there are a number of systems based on Lab and importantly, they do not all employ the same conversion formula to rgb

I'll bet that if you plug the Lab values (53.75, 43.63, 28.62) given for the colour you mentioned into the different formulas one of them will give you 198,93,82 and another of them will give you 120,27,20

Naturally, the contents of my comment are entirely moot if the exact same code is used to convert from Lab -> RGB and also if the tests are performed on different machines, since RGB values are device-dependant, while Lab values are not.

What a curly problem you have! D'Oh! | :doh:

"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon

ah, thanks for your reply.
different point of view. will try to by-pass Lab values with RGB instead of conversion.

thanks again.

You're welcome. Smile | :)

It certainly seems like an avenue of investigation worthy of consideration - one less thing to introduce unnecessary(?) complexity.

"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon

gopi_cpp wrote:
Using color picker, for old application

What colour picker are you referring to, and how do you select the values?

Hello Richard,

I am using the colorpic which is downloaded from the link below.

http://www.iconico.com/colorpic/[^]

if you move the mouse over any place, the application will display the color values.

Regards,
A. Gopinath.

I do not understand. You already have the required values in a text file so why do you need a colour picker.

This color picker is only for checking the color values.
this is nowhere related with the application.

So what does any of this have to do with your problem?

Just need to know that will there be a color difference in visibility with application created in VC++ 6.0 and VC++ 2010.

No difference, assuming your code is correct: RGB values are constants.

Could it be different default palettes?

onwards and upwards...

Hi,
step by step I am creating a Visual Studio Style IDE Project, but I am running in a bunch of problems.

My application is MDI based, created in Visual Studio Style with Project Wizard.

Further I added functionality for viewing different views for each document.
For this views I need to set an application specific Windows title.

Actually I found hints how to solve:

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
    cs.style &= ~(LONG) FWS_ADDTOTITLE;  
    return CFrameWnd::PreCreateWindow(cs);
...

CMyView::OnInitialUpdate()
{
    CView::OnInitialUpdate();
    GetParent()->SetWindowsText(_T("myText"));

But it works only partially. The default view's title disappears, but my own one is not displayed.
The title in the tab header is empty after the changes.

Maybe it is because my view is a splitter view or the ChildFrame is with a Tab Control.
I have no idea, how to solve. Anybody, who has an idea?
Many Thanks!

Member 8534035 wrote:

GetParent()->SetWindowsText(_T("myText"));

Does this even compile?

Have you seen this?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

uups...sorry...the source code I have written manually on the post, because my development environment is on another computer. but in principal it is according to what I have programmed

oh...many thanks for the link!

finally it works now!

according to the link I override:

void CMainFrame::OnUpdateFrameTitle( BOOL bAddToTitle )

but this is affecting the application main title.

but overriding

void CChildFrame::OnUpdateFrameTitle( BOOL bAddToTitle )

does exactely what I need!

many thanks for your help! I searched already at least 2 hours for a solution!

Hi,

I want to perform system restore programmatically either using VC++ or powershell.
I have tried using '

SystemRestore

' WMI class (https://msdn.microsoft.com/en-us/library/windows/desktop/aa378925(v=vs.85).aspx[^]) and

VB

Restore-Computer

(https://technet.microsoft.com/en-us/library/hh849845.aspx[^])

But both triggers a reboot.
Could you please help to find whether there is another option that restores the system without a reboot?

Regards,
Krishnakumartg

Krishnakumartg wrote:
restores the system without a reboot

There is no such option. Restoring the system involves replacing system files, which will be in use. The only way to replace them is to reboot.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Is it not possible even if the restore point has has no system files (d:\, e:\ etc)?

Regards,
Krishnakumar