Create a fixed-sized PNG with fixed Width/Height?

lykos92 · 05-20-2009, 09:12 AM

Hi again, I have a PNG image (with transparency) which is 107,854 bytes. Its dimensions are 722x336. I want to make an empty PNG image, with the same dimensions and the same size. Can anyone help me? Any suggestions?

**koala** · 05-20-2009, 10:35 AM

If you're using Photoshop, create a new document, set the height and width to 722 and 336, set the background to transparent, then save as a png.

lykos92 · 05-20-2009, 10:42 AM

Yeah, I know how to create an image. What I want is to create an image which is 107,854 bytes exactly. It's not BMP, so the size changes from various factors, not only the dimensions.

**koala** · 05-20-2009, 10:49 AM

I just created an empty transparent 722x336 png with no interlacing, and its filesize is about 5kb, so I don't know how you'll get it up to 107kb.

Is there any reason why it has to be exactly that size? There might be a workaround.

lykos92 · 05-20-2009, 12:37 PM

Well, there is this program called "wirecast" which puts a watermark on the output video. I have found the watermark PNG file, but when I erase the picture, it says that the program cannot start. So I believe that it checks the file size on startup.

**jamiemac2005** · 05-20-2009, 03:25 PM

Hey, the reason it puts a watermark on the video is because it is expensive software that has taken someone a lot of time to write, so we can't help you.

As it happens this can't be done, because an empty .png file just contains the basic document data(and couldn't be modified to grow to a specific size).

Cheers,
Jamey

DonaldG · 05-22-2009, 10:35 AM

Quote:

Originally Posted by lykos92

Well, there is this program called "wirecast" which puts a watermark on the output video. I have found the watermark PNG file, but when I erase the picture, it says that the program cannot start. So I believe that it checks the file size on startup.

As Jamiemac points out, what you are trying to do is circumvent (crack) software security system.

I is against the TSF policy to help. Please read the TSF rules before posting. Thanks

Thread Closed.

05-20-2009, 09:12 AM	#1 (permalink)
lykos92 Registered User Join Date: Mar 2008 Location: Salonica, Greece Posts: 37 OS: Windows Vista Ultimate x64 SP2	Create a fixed-sized PNG with fixed Width/Height? Hi again, I have a PNG image (with transparency) which is 107,854 bytes. Its dimensions are 722x336. I want to make an empty PNG image, with the same dimensions and the same size. Can anyone help me? Any suggestions? __________________ "What are you doing, Akane?" "Nothing." "Let's go!" "Okay."

05-20-2009, 10:35 AM	#2 (permalink)
koala Moderator Hardware Team Join Date: Mar 2005 Location: UK Posts: 12,166 OS: XP/7/Ubuntu My System	Re: Create a fixed-sized PNG with fixed Width/Height? If you're using Photoshop, create a new document, set the height and width to 722 and 336, set the background to transparent, then save as a png. __________________ New members: Subscribe to your thread (Thread Tools) to receive an instant email notification when you get a reply. TSF Folding@Home Team 85015 - details here

05-20-2009, 10:42 AM	#3 (permalink)
lykos92 Registered User Join Date: Mar 2008 Location: Salonica, Greece Posts: 37 OS: Windows Vista Ultimate x64 SP2	Re: Create a fixed-sized PNG with fixed Width/Height? Yeah, I know how to create an image. What I want is to create an image which is 107,854 bytes exactly. It's not BMP, so the size changes from various factors, not only the dimensions. __________________ "What are you doing, Akane?" "Nothing." "Let's go!" "Okay."

05-20-2009, 10:49 AM	#4 (permalink)
koala Moderator Hardware Team Join Date: Mar 2005 Location: UK Posts: 12,166 OS: XP/7/Ubuntu My System	Re: Create a fixed-sized PNG with fixed Width/Height? I just created an empty transparent 722x336 png with no interlacing, and its filesize is about 5kb, so I don't know how you'll get it up to 107kb. Is there any reason why it has to be exactly that size? There might be a workaround. __________________ New members: Subscribe to your thread (Thread Tools) to receive an instant email notification when you get a reply. TSF Folding@Home Team 85015 - details here

05-20-2009, 12:37 PM	#5 (permalink)
lykos92 Registered User Join Date: Mar 2008 Location: Salonica, Greece Posts: 37 OS: Windows Vista Ultimate x64 SP2	Re: Create a fixed-sized PNG with fixed Width/Height? Well, there is this program called "wirecast" which puts a watermark on the output video. I have found the watermark PNG file, but when I erase the picture, it says that the program cannot start. So I believe that it checks the file size on startup. __________________ "What are you doing, Akane?" "Nothing." "Let's go!" "Okay."

05-20-2009, 03:25 PM	#6 (permalink)
jamiemac2005 Design Team Member Join Date: Jul 2007 Location: Coventry, UK Posts: 1,853 OS: Vista, various linux distros	Re: Create a fixed-sized PNG with fixed Width/Height? Hey, the reason it puts a watermark on the video is because it is expensive software that has taken someone a lot of time to write, so we can't help you. As it happens this can't be done, because an empty .png file just contains the basic document data(and couldn't be modified to grow to a specific size). Cheers, Jamey __________________ Myspace