ibisPaint

Lecture

39. Changing image resolution with Resize

Image resolution change is needed “for screens”, that is, when posting your final artwork on social network websites, and “for print”, that is, for printing your final artwork.

First of all, we are going to look at the resolution setting for screens.

From ①the Tool Selection window, select ②Canvas tool.

Select ①Resize.

Turn on ①Keep Aspect Ratio.
Resolution change for screens can be done by selecting ②Pixels.
For screens, you will be changing the pixel count (px), instead of dpi.
Change ③the Width (px) from 768 to 50. Once you are done, tap on ④✓ to finish.

Setting the pixel count to a significantly lower resolution worsens the image quality.
If you decrease the pixel count, you will get more maximum layer limit. Once you reach your maximum layer, try decreasing the pixel count. Also, decreasing the size of the canvas can help you work faster, and make the files take up less space on your device. Now, you can adjust the size of the screen with pixel count (px), and not with dpi.

Next, we will cover resolution settings for printing.
For artwork you would like to print, you can change the canvas size in mm and resolution (dpi). Set the dpi to minimum 300 for clean printed results. Dpi refers to dots per inch (25.4mm).
Caution: when requesting a printing shop to print your artwork, make sure to be aware of your dpi and size. It is extremely difficult to change the dpi afterwards.

Turn on ①Keep Aspect Ratio. Changing resolution for artwork to be printed can be done by first selecting ②Print.
In print, select dpi. Adjust ③the dpi from 350 to 50.
Once you are done setting the new value, tap on ④✓ to finish.

Decreasing the dpi as shown will worsen the image quality.
Next, we will cover reduction calculation method.

Turn on ①Keep Aspect Ratio. Set the size: ②Width(px) from 768 to 150.
Tap ③Linear, to select a calculation method from Sampling, Linear, and Trilinear.

This is a comparison image.
From the left, the quality changes from low to medium to high. Normally, we suggest choosing Trilinear (since Trilinear uses hardware functions, it may not be applicable in some devices).
Next, we will cover magnification calculation method.

Turn on ①Keep Aspect Ratio. Set the size: ②Width (px) from 50 to 1,500. Tap ③Linear, and choose a calculation method from Nearest Neighbor and Linear.

Here is an image quality comparison between canvases processed by Nearest Neighbor and Linear. Normally, it’s better to choose Linear.

Chapter

  1. Introduction
  2. Let's Take a Look at Some Sample Artwork
  3. Start Creating an Artwork
  4. Toolbar and Tool Selection
  5. Do Your Draft Sketch by Hand
  6. About Layers
  7. Let’s Trace
  8. Undo and Eraser
  9. Fine Tuning Using the Lasso tool
  10. Check by Reflecting Horizontally
  11. Select Colors in the Color window
  12. Use Color Fill for the Undercoat
  13. Making a Selection with the Magic Wand
  14. Making a Gradation (Shading)
  15. Quick Eyedropper Function
  16. Create Highlights and Shadows
  17. Paste a Texture
  18. Let's Merge Layers
  19. Sign Your Artwork
  20. View Your Artwork
  21. Post Your Artwork
  22. Share Your Artwork
  23. Remove-Ads Add-on
  24. Add Color to the Analog Image using Multiply
  25. Selection Layer
  26. Let’s try using Screentone
  27. Clipping is convenient
  28. Changing the color with Alpha Lock
  29. Save Layer as Transparent PNG command
  30. Save Canvas as Transparent PNG command
  31. Naming your layers to manage them
  32. Putting texture to the floor with Perspective Form
  33. Skirt with Mesh Form
  34. Entering text with Text tool
  35. Creating manga with Frame Divider tool
  36. Enlarging the canvas with Canvas Size
  37. Cutting off the canvas with Trim
  38. Canvas creation with resolution (dpi) specification
  39. Changing image resolution with Resize
  40. Texture with Material tool
  41. Straight Ruler
  42. Circular Ruler
  43. Elliptical Ruler
  44. Radial Ruler
  45. Mirror Ruler
  46. Kaleidoscope Ruler
  47. Array Ruler
  48. Stabilizer
  49. Straight line with Drawing tool
  50. Cut, Copy, Paste
  51. Filter: Brightness & Contrast
  52. Filter: Hue Saturation Lightness
  53. Filter: Color Balance
  54. Filter: Extract Drawing
  55. Filter: Change Drawing Color
  56. Filter: Mono Color
  57. Filter: Gray Scale
  58. Filter: Black & White
  59. Filter: Posterize
  60. Filter: Gaussian Blur
  61. Filter: Zooming Blur
  62. Filter: Moving Blur
  63. Filter: Mosaic
  64. Filter: Stroke (Both)
  65. Filter: Stained Glass
  66. Filter: Wet Edge
  67. Filter: Glow (Inner)
  68. Filter: Stroke (Outer)
  69. Filter: Drop Shadow
  70. Filter: Parallel Gradation
  71. Filter: Concentric Gradation
  72. Filter: Radial Line Gradation
  73. Filter: Sphere Lens
  74. Filter: Blur Frame
  75. Switching devices / transferring data with Dropbox
  76. Switching devices / transferring data with SD card on Android
  77. Switching devices / transferring data with PC on iOS
  78. Settings window details
  79. Bucket tool details
  80. Blend mode details
  81. How to upload transparent PNG onto Twitter
  82. Notes About Tracing