Photoshop grayscale image displays incorrectly in my browser

MH
Posted By
Mike_Hope
Oct 12, 2008
Views
428
Replies
3
Status
Closed
I take part in some on-line photo contests and I was judging some entries. I happened to download a rather dark black and white entry into Photoshop and noticed it was several shades lighter in Photoshop than in my browser. It loaded in Photoshop in Grayscale mode. So I tried this:

1. Open Photoshop.
2. Set the background colour to 53 Red, 53 Green, 53 Blue.
3. Select File – New, set the Width to 800 pixels; the Height to 600 pixels; leave Resolution at 72; set Color Mode to Grayscale – 8 bit; set Background Contents to Background Color; and click OK.
4. Save as a jpeg (maximum quality).
5. Open the jpeg in your browser.

When I do this the browser image (I tried both IE and Firefox) is a shade or two darker than the Photoshop image. I used the Colorzilla extension in Firefox to measure the actual color displayed and it comes out at 37 Red, 37 Green, 37 Blue.

Anyone know what’s happening here?

Thanks,
Mike

Master Retouching Hair

Learn how to rescue details, remove flyaways, add volume, and enhance the definition of hair in any photo. We break down every tool and technique in Photoshop to get picture-perfect hair, every time.

C
Curvemeister
Oct 13, 2008
Open the color settings dialog (ctrl-shift-K) and set your grayscale space to Grayscale Gamma 2.2.
MH
Mike_Hope
Oct 13, 2008
Thanks very much. That’s much better. I obviously need to learn a bit about color profiles 🙂

My test file now displays the same in my browser as it does in Photoshop.

The file I downloaded from the web and opened in Photoshop was still opening lighter in Photoshop so I checked the check box Profile mismatches – Ask when opening". This causes a dialog to appear when I open the file saying it was using "Dot Gain 15%". Does the presence of this profile mean he/she was using Photoshop? Converting it to the working (2.2) profile and saving it creates a jpeg that is the same in my browser and Photoshop. Do files always display the same in Photoshop regardless of the profile? I notice there is no difference in appearance in Photoshop if I open the original downloaded file using it’s embedded profile, or converting it to my working (2.2) profile.
C
Curvemeister
Oct 14, 2008
"Dot Gain 15%" profile means it’s 99% likely the image was edited in Photoshop.

Yes, converting to a profile does not change the appearance in Photoshop. It does alter the color numbers that make up the image. Being "color aware", Photoshop uses the embedded profile information to convert the color numbers to match your display, so the appearance does not change

Most web servers don’t perform any translation, simply copying the color numbers from the image to the display. The main consequence of this is that the appearance will change depending on the profile that was used to create the image. Gray gamma 2.2 is a much closer match to the average display than Dot Gain 15%, which is designed for newsprint, so the appearance will change much less.

How to Improve Photoshop Performance

Learn how to optimize Photoshop for maximum speed, troubleshoot common issues, and keep your projects organized so that you can work faster than ever before!

Related Discussion Topics

Nice and short text about related topics in discussion sections