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Configure allowed file types and DPI restrictions | Chamevo Support Center
Configure allowed file types and DPI restrictions
Control which image formats customers can upload and set DPI thresholds for upload quality ratings.
Updated April 28, 20265 min read
The File Uploads tab in a print profile controls which image formats customers can upload and how upload quality is assessed. Use these settings to ensure customers provide files that meet your production standards.
Before you start
You have access to your WordPress admin.
You know your printer's file format and DPI requirements.
Supported file types
Chamevo supports four upload formats:
Format
Best for
Notes
JPEG
Photos, full-color images
Requires minimum DPI for print quality. No transparency support
PNG
Logos, designs with transparency
Recommended for apparel and products with transparent backgrounds
SVG
Vector graphics, logos, line art
Scalable at any size. Supports per-path coloring
PDF
Print-ready documents
High-quality output. Good for professional print submissions
Edit the profile you want to configure (Master or custom).
Open the File Uploads tab.
Under Restrictions, find Allowed File Types.
Select or deselect formats: JPEG, PNG, SVG, PDF.
Click Save Changes.
Customers can only upload files in the formats you enable. If a customer tries to upload a disabled format, the upload is rejected.
Set minimum DPI
In the File Uploads tab under Restrictions, find Minimum DPI.
Enter the minimum DPI value (for example, 300).
Click Save Changes.
Files below this DPI are blocked. The minimum DPI check applies to JPEG and PNG uploads only — SVG and PDF are not raster formats and do not have a meaningful DPI value.
Configure image quality ratings
Quality ratings give customers visual feedback about their upload quality before they finalize the design. Three thresholds define the rating bands:
Set Image Quality Low DPI — uploads below this DPI show a low quality indicator.
Set Image Quality Mid DPI — uploads at or above this DPI (but below High) show a medium quality indicator.
Set Image Quality High DPI — uploads at or above this DPI show a high quality indicator.
Example for standard print production:
Setting
Value
Minimum DPI
150
Image Quality Low DPI
200
Image Quality Mid DPI
300
Image Quality High DPI
600
With these settings, uploads below 150 DPI are blocked. Uploads between 150–199 DPI show low quality, 200–299 show medium, 300–599 show high, and 600+ show excellent.
Leave the quality fields empty to disable the rating indicator.
Set maximum file size
In Restrictions, find Maximum Image Size (MB).
Enter the maximum file size in megabytes (default is 10).
Click Save Changes.
Large files slow down the upload process and can cause server timeouts. Set this to a reasonable limit for your product type.
Configure image transformations
Under the Transformations section in the File Uploads tab, you can control how uploaded images are processed:
Setting
Default
What it does
Scale To Width
0 (disabled)
Resize images by width when width > height. Accepts pixels (e.g. 400) or percentage (e.g. 80%)
Scale To Height
0 (disabled)
Resize images by height when height > width. Accepts pixels or percentage
Minimum Scale Limit
0.01
Smallest resize factor customers can apply
Advanced Editing
Off
Enable bitmap editing tools (filters, background removal) for uploads
Applied Filter
None
Auto-apply a filter to every upload: Grayscale, Black & White, Threshold, or Threshold Negative
Scale To Width/Height automatically resize uploads to fit your canvas. Use percentage values (e.g. 80%) to scale relative to the canvas dimensions, or pixel values for absolute sizing.
DPI recommendations by product type
Product type
Minimum DPI
Recommended DPI
T-shirts / apparel
150
300
Business cards
300
300
Posters / large format
150
300
Photo products (mugs, cases)
200
300
Stickers / labels
300
600
Engraving
300
600+
Check your setup
Open a product on your store that uses the configured print profile.
Launch the product customizer.
Upload a JPEG below the minimum DPI. Confirm it is rejected.
Upload a PNG at mid-range DPI. Confirm the quality indicator shows the correct rating.
Try to upload a disabled file type. Confirm it is rejected.
Upload a file larger than the maximum size. Confirm it is rejected.
Troubleshooting
Minimum DPI does not block low-resolution uploads. Minimum DPI only applies to JPEG and PNG files. SVG and PDF files are not checked. Verify the profile is assigned to the product.
Quality rating does not appear. All three quality DPI fields (Low, Mid, High) must have values. Leave them all empty to disable the feature, or fill in all three to enable it.
Applied filter does not work. The Applied Filter requires the Imagick PHP extension. Check your server configuration in Chamevo > Utilities.
Uploads fail with no error message. Check the Maximum Image Size (MB) setting. Also verify your server's upload_max_filesize and post_max_size PHP settings — they may be lower than the Chamevo limit.
Q: What is the difference between Minimum DPI and Image Quality DPI thresholds?
A: Minimum DPI is a hard block — uploads below it are rejected. Image Quality DPI thresholds are informational — they show a quality rating to the customer but do not block the upload.
Q: Does the DPI setting in File Uploads affect the export DPI?
A: No. File Upload DPI settings control upload quality (input). Export DPI is set separately in Chamevo > Settings > Export under Image DPI and controls the output file resolution.
Q: Can I allow different file types for different products?
A: Yes. Create a custom print profile with the file types you want and assign it to the product. The custom profile overrides the Master Print Profile's file type settings.
Q: Why should I disable JPEG for apparel?
A: JPEG does not support transparency. For apparel, PNG is preferred because the transparent background allows the garment color to show through. Disabling JPEG encourages customers to upload PNG or SVG files.
