Text on image has "artifacts" around it

[eramgarden]

I have a Tiff image, I process it, make it into JPG, add "text" to the buttom of the image. The guy I was doing this for..opened the image in PhotoShop and he says he sees "artifacts" around the text. He sent me the screen print..he has blown up the image and around the text ..there are some grey boxes. Its not visible in my browser or when I open it in Paint...seems like its visible in Photoshop...

Wonder how the "artifacts" got there?? This is what he asked me:
"It appears as if the texts bounding box
left the artifacts. Is it possible to increase quality/decrease compression a bit to improve or eliminate this?"

--Hard to explain without seeing what he sent me...but this is the code I have to put text at the bottom of the image:


Dim bgBrush = New SolidBrush(System.Drawing.Color.White)
gr.FillRectangle(bgBrush, New Rectangle(0, 0, 700, 500))
gr.DrawImage(b, centerW, centerH)
Dim copy As Font = New Font("Times New Roman", 9, FontStyle.Regular)
gr.DrawString("Copyright

 

[PlausiblyDamp]

This is probably a consequence of using jpeg compression, too achieve high compression rates jpeg implements a lossy compression that works well for photorealistic images. However a side effect of this is that when you get two colours next to each other then they will cause these artifacts to occur.
you may be better off considering another image format (like gif or png)