I builded an application to automatically generate PDF, taking data from a DB, but recently the customer noticed that the images were rendered different, using RGB color profile, instead of CMYK.
So I tried to build a simple test code, in order to find what could be the problem, but the result was the same.
Here my example code:
controller
namespace PdfTest.Controllers
{
public class HomeController : Controller
{
private string _license;
public HomeController()
{
_license = ConfigurationManager.AppSettings["abcPDFLicense"];
XSettings.InstallLicense(_license);
}
public PartialViewResult Index()
{
using (Doc doc = new Doc())
{
doc.HtmlOptions.Engine = EngineType.Gecko;
doc.HtmlOptions.AddLinks = true;
string html = RenderRazorViewToString("Index", "");
int pageId = doc.AddImageHtml(html, true, 2500, true);
while (doc.Chainable(pageId))
{
doc.Page = doc.AddPage();
pageId = doc.AddImageToChain(pageId);
}
for (int i = 1; i <= doc.PageCount; i++)
{
doc.PageNumber = i;
doc.Flatten();
}
string pdfDirectory = Server.MapPath("~/PDF_Diesel");
DirectoryInfo directoryInfo = new DirectoryInfo(pdfDirectory);
if (!directoryInfo.Exists)
directoryInfo.Create();
string fileName = "test.pdf";
doc.Rendering.ColorSpace = XRendering.ColorSpaceType.Cmyk;
doc.Save(string.Format(@"{0}\{1}", directoryInfo.FullName, fileName));
doc.Clear();
}
return PartialView();
}
public string RenderRazorViewToString(string viewName, object model)
{
ViewData.Model = model;
using (var sw = new StringWriter())
{
var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
var viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
viewResult.View.Render(viewContext, sw);
viewResult.ViewEngine.ReleaseView(ControllerContext, viewResult.View);
return sw.GetStringBuilder().ToString();
}
}
}
}
view
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<img src="file://@Server.MapPath("~/Images/_banner2.jpg")" />
<img src="~/Images/_banner2.jpg" />
</body>
</html>
This code returns me a view with the loaded image and a sample pdf with that image only, but still continue to render the image in RGB, not in CMYK.
I read ABCpdf docs, but I didn't found the solution of my problem, does anyone knows what could be the issue?
Ok, I figured out what was the issue.
I didn't know that HTML doesn't render CMYK color profile, but only RGB.
To solve the problem I changed all the images color profile with photoshop from CMYK to S_RGB, without losing so much quality of the colors, thankfully.