Re: [Lcms-user] Difficulty with cmsTransform in C#

[Edgar L. <lo...@co...>]

Did you declare input[] and output[] as volatile?
(s. https://msdn.microsoft.com/de-de/library/x13ttww7.aspx)

Edgar


Am 16.06.2016 um 21:25 schrieb Roger Breton:
> Tengo una pequena problema...
>
> I need to convert 400 RGB values to Lab using a monitor profile.
>
> I use the following C# code :
>
>   string Source = "Monitor.icm";
>   IntPtr hSource = cmsOpenProfileFromFile(Source, "r");
>
>   xform = cmsCreateTransform(hSource, TYPE_RGB_DBL, hLab2, TYPE_Lab_DBL,
> INTENT_ABSOLUTE_COLORIMETRIC, 0);
>
>   for (int i = 0; i < 400; i++)
>   {
>           input[0] = R[i];
>           input[1] = G[i];
>           input[2] = B[i];
>
>            cmsDoTransform(xform, input, output, 1);
>
>            L = output[0];
>            a = output[1];
>            b = output[2];
> }
>
> First time through the loop I get valid Lab results.
> But subsequent passage through the loop always return the same Lab values?
> The input[] values do change as expected.
>
> When I use this code outside of a loop, it works perfect.
>
> / Roger Breton
>
>
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