You do not need Photoshop or Gimp anymore and you do not have to work with layers.
Just take a screenshot of your application and put this into the Screen maker.
It will do the best screenshot of your application, ready to post on your website or blog.In short, this application allows to connect 2 images: screenshot and smartphone image, the result is image ready to post on website or blog.
Screen maker supports 18 kinds of resolutions:
240x320, 240x400
320x480, 360x640
480x800, 480x854, 480x600, 480x1024
540x960
640x960, 600x800, 600x1024
720x1280, 768x1280, 800x1280
1080x1920, 1200x1920
1600x2560
After finished work, you can see your image or share it.
Devices
*Nexus smartphones
Nexus 5
Nexus One
Nexus S
Galaxy Nexus
Nexus 4
Nexus 7
Nexus 10
Nexus 7 (2013)
*HTC smartphones
HTC One
HTC DNA
HTC One X
HTC One X+
HTC One V
HTC One S
HTC Evo 4G LTE
HTC Evo 3D
HTC Incredible S
HTC Sensation
HTC Desire X
HTC Desire HD
HTC HD2
HTC Wildfire S
HTC Explorer
HTC Dream
HTC Eris
HTC Jetstream
HTC Desire S
HTC Desire Z
HTC Sensation XE
*Samsung smartphones
SGS 4 Active
SGS 4
SGS Advance
SGS
SGS2
SGS3
SGS3 mini
Samsung Note 3
Samsung Note 2
Samsung Note
Samsung Y
Samsung W
Samsung ACE
Samsung Galaxy Tab 2 7.0
Samsung Galaxy Tab 10.1
Samsung Galaxy Exibit 4G
Samsung Galaxy Mini 2
Samsung Galaxy Mini
Samsung Gio
Samsung Note 8.0
*Sony smartphones
Sony Xperia Z "Yuga"
Sony Xperia ZL
Sony Xperia S
Sony Xperia P
Sony-Ericsson Xperia X10
Sony-Ericsson Xperia Arc S
Sony Xperia Tipo
Sony Xperia Ray
Sony Xperia T
Sony Xperia Play
Sony Xperia Miro
Sony Xperia Mini
Sony Xperia Sola
Sony Xperia SP
*Motorola Smartphones
Motorola Razr M
Motorola Photon 4G
Motorola Razr
Motorola Motoluxe
Motorola Atrix 4G
Moto X
Asus Transformer
Meizu MX
ZTE Blade
ZTE Skate
Oppo Find 5
Oppo R819
Kindle Fire
LG Optimus G
Zopo ZP990
Nokia Lumia 925