Mike Sibley
In my N. Yorkshire studio
October 20/21
Only 2 places remaining

Workshops ONLINE
Join me at
full details

JD Hillberry
Milpitas, CA :
October 19 - 21

Subject: Smooth Skin
full details
Fort Worth, TX :
November 9 - 11

Subject: Rough Skin / Dark background
full details
Austin, TX :
November 16 - 18

Subject: Realistic Still Life
full details
Pencil Kit & DVD
Everything I supply in my live workshops
full details


For registration, logging in or any other queries but first click the FAQ button above for answers. And post your suggestions here for making The Drawing Forum the best online drawing community.

Moderator: Mike Sibley

Site Admin
User avatar
Posts: 773
Joined: Fri Jan 11, 2013 10:42 pm
Location: Thirsk, UK


Postby Mike Sibley » Sun Jan 20, 2013 11:17 pm

All images posted to The Drawing Forum must not exceed 500KB in size or be physically HUGE!

There are a number of ways to avoid this by using almost any imaging software such as Photoshop, Photoshop Elements, GIMP, or even the program that was supplied with your camera - or sometimes even your scanner. Or you can use this Online Resizer.

Scanners will almost always produce better results than your digital camera. Cameras will automatically read white as a light grey and the light (daylight or artificial) will cause a colour-cast to appear.

Scan your artwork at 300ppi (pixels per inch) and in COLOUR:
COLOUR scans at 32 bits per pixel
GREYSCALE scans at 8 bits per pixel
so you will capture more information about your image by scanning in colour.

Now open your scan in Photoshop (or whatever program you use) and set about resizing it:

Currently you are restricted here at TDF to a maximum width of 800 pixels and a maximum file size of 500 KB. First, if necessary, crop away anything that is not your image, such as the paper margins, and then reduce the resolution from your scanner's 300ppi to 96 or even 72ppi. Both are monitor resolutions - you will not gain any advantage by using a larger resolution. Also, 300ppi is the commercial printing resolution - if someone steals your image online, do you really want to make it commercially usable? Finally, resize your image to a width smaller than 800 pixels (there is no height restriction).

REDUCING THE FILE SIZE (removing colour):
If your image is of a graphite or charcoal pencil drawing, or any medium that doesn't contain colour, you can now slash your file size by up to two thirds by removing the colour information from it. You scanned in colour... right? You did that to capture the greatest amount of information, but now you have it you no longer need to save all those values in colour.

In Photoshop simply go to the top menu > Image > Mode > Greyscale - then click OK. That is not the same as "desaturating" (SHIFT+CTRL+U). Desaturating removes the colour but needlessly retains the 32 bits of information, so your file size remains as big as it was previously. Use the greyscale function.

Now check your new image data - the file size should be below 500 KB. Our system will refuse to accept your image is it is larger.

Do NOT save your resized image to overwrite your original image. I suggest you keep a folder for these resized images to keep them separate from the larger originals (assuming you want to keep them). Simply save your smaller image into that folder and preferably using a new name, such as "ThisTitle_small.jpg".

Your image is now ready for uploading to your TDF post!

Use the JPG (JPEG) format at all times here at TDF. Our system may accept other formats but it can only make thumbnail images from JPGs.

Do NOT embed your images in PDF files or any similar file systems. Post them as raw JPGs.

If you have any problems or don't understand something, contact Admin at
Mike Sibley
Book: Drawing from Line to Life
Blog : Drawing from Line to Life blog
Visit my Starving Artists for free and subscription galleries


Who is online

Users browsing this forum: No registered users and 3 guests