Compress PNG - GameCreators Forum

Author

Message

Behdadsoft

15

Years of Service

User Offline

Joined: 7th Apr 2009

Location: Tehran-Iran

Posted: 22nd Jan 2015 23:08 Edited at: 22nd Jan 2015 23:23

Link

Hi

I want compress my PNG files fot decrease APK size and usage memory after load Pictures.Now I want Know if I compress my PNG files don't exist any problem for run on different devices?

Thanks

Back to top

Profile PM

Kevin Picone

22

Years of Service

User Offline

Joined: 27th Aug 2002

Location: Australia

Posted: 23rd Jan 2015 00:39

Link

Quote: "I want compress my PNG files fot decrease APK size and usage memory after load Pictures"

Storing image media as PNG files generally won't alter the applications run time memory usage. This is because, when a file is loaded from disc to memory, it's decompressed into the devices pixel format of choice. So even though a picture might be stored as say 8bit (256 colour), when it's loaded it's decompressed to 32bit colour. This is easier for the decide to deal with.

Convert PlayBASIC To Machine Code

Back to top

Profile PM Website

paulrobson

10

Years of Service

User Offline

Joined: 22nd Nov 2014

Location: Norfolk, England

Posted: 23rd Jan 2015 10:48

Link

With AppGameKit you can scale and expand the sprites to suit. So you could (say) reduce some of your image sizes by half, then rescale it back up. The problem with this is, of course, lost detail.

The best way I reckon to do this is to acquire from some friends or family some unused phones, Android devices especially can be got pretty much for free. You can then see how well your code works on lower powered devices ; there's no point in testing on Windows, an iPad and a Nexus 7. The graphic throughput (on say the benchmark demo) between devices is quite significant.

Back to top

Profile PM Email

BatVink

Moderator

21

Years of Service

User Offline

Joined: 4th Apr 2003

Location: Gods own County, UK

Posted: 23rd Jan 2015 11:09

Link

To expand on the good advice above, AppGameKit images will always be 32 bits per pixel. By compressing your images you actually slow down your app while it is loading the image and converting it back to an uncompressed image.

Quidquid latine dictum sit, altum sonatur

Back to top

Profile PM Email

Behdadsoft

15

Years of Service

User Offline

Joined: 7th Apr 2009

Location: Tehran-Iran

Posted: 23rd Jan 2015 11:13

Link

Ok,I Understood. Thanks All for help.

Back to top

Profile PM

CJB

Valued Member

20

Years of Service

User Offline

Joined: 10th Feb 2004

Location: Essex, UK

Posted: 23rd Jan 2015 14:40

Link

Consider using Atlas images too and perhaps something like Spine if animating sprites to reduce the amount of media required.

V2 T1 (Mostly)
Uzmadesign

Back to top

Profile PM Email Website

paulrobson

10

Years of Service

User Offline

Joined: 22nd Nov 2014

Location: Norfolk, England

Posted: 23rd Jan 2015 14:45

Link

IME 8 bit quantization is not that brilliant. It is also important to be sensible about these things. If you have audio, music or especially video these are likely to occupy far more memory than an image.

Back to top

Profile PM Email

Digital Awakening

AGK Developer

22

Years of Service

User Offline

Joined: 27th Aug 2002

Location: Sweden

Posted: 29th Jan 2015 11:15

Link

Png uses lzw compression. Things like photos or images with gradients takes up a lot more space. Also, compressing to 8 bit or 16 bit instead of 32 bit can save a lot of space. So if you are looking to shrink the actual apk size and your images are large then look into this.